Perhaps you should try some spelling variations:
sang tao » hang tai
hanh dai » hanh tai, hanh dao, vanh dai
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
dai su » dai sua, dai so, dan su

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 (sang tao)) hoi. hieu va cau luc va hanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang ma) OR (sang tao)) hoi. hieu va cau luc va hanh dai su triet.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang ma) or (sang tao)) hoi. hieu va cau luc va hanh dai su triet*.