Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh tri » thanh tri, hanh tai, hanh trinh
cau phuc » cau truc, chau phu, huu phuc
cau luc » cau truc
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang ma) or (lang xa)) hoi. hieu ve ((cau luc) OR (cau phuc)) va hanh tri va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang ma) OR (lang xa)) hoi. hieu ve ((cau luc) OR (cau phuc)) va hanh tri va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((nang ma) or (lang xa)) hoi. hieu ve ((cau luc) OR (cau phuc)) va hanh tri va triet".
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang ma) or (lang xa)) hoi. hieu ve ((cau luc) OR (cau phuc)) va hanh tri va triet*.