The phrase "attempts principally" is correct and usable in written English.
It can be used to indicate that the main focus or primary effort of the attempts is directed towards a specific goal or area.
Example: "The research team makes attempts principally to improve the efficiency of renewable energy sources."
Alternatives: "efforts mainly" or "endeavors primarily".
Yet it was precisely his experience of depression and a pattern of repetitive self-harm (that Hatton refers to as "the suicide attempts") which principally motivated his return to the ring.
Mr. Gomes has backed these plans — principally attempts to downsize the armed forces — which have been resisted by the military.
For the normative ethical stakeholder theory literature in business ethics consists principally in attempts to address one or more of the questions (whether ethical, ontological, or epistemic) this characterization leaves unanswered: Who counts, i.e., who are the stakeholders?
In later years, when he became a popular interviewee about his great years, Dundee would mischievously recall how he was forced to share a hotel room with Pastrano, principally to attempt to keep his fighter from pursuing and bedding almost any compliant woman he encountered.
This produces two groups: one in which there is recurrent self-induced vomiting or laxative misuse, often accompanied by subjective binge eating, and the other principally characterised by attempts to follow extreme dietary rules.
Aware of the limitations imposed by time and place on every historian, he attempted to achieve maximum objectivity principally by identifying himself not with a "party" but with the state.
Mrs Arroyo's opponents, however, showed no desire for reconciliation, indicating that they would continue their campaign to remove her, using methods that will further test that resilience.The opposition had attempted to impeach Mrs Arroyo principally on the ground that she cheated in last year's presidential election.
Previous attempts to cast Cruise as a principally romantic lead – notably the drippy Blarney of Ron Howard's Far and Away – had fit him like a three-fingered glove.
Similarly many of my acting colleagues are attempting to forge successful careers overseas, principally in the US.
Arrhenius's work in immunochemistry, a term that gained currency through his book of that title published in 1907, was an attempt to study toxin-antitoxin reactions, principally diphtheria reactions, using the concepts and methods developed in physical chemistry.
