Perhaps you should try some spelling variations:
cuc triet » cua triet, su triet, cac trieu
can thuc » dan thuc, van thuc, cay thuc
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang xa hoi. ((hieu ve) or (hieu qua)) ((cau truc) or (can thuc)) va doanh tai cuc triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang xa hoi. ((hieu ve) OR (hieu qua)) ((cau truc) OR (can thuc)) va doanh tai cuc triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang xa hoi. ((hieu ve) or (hieu qua)) ((cau truc) or (can thuc)) va doanh tai cuc triet*.