Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sang tao » hang tai
hanh dai » hanh tai, hanh dao, vanh dai
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
co sach » bo sach, cuon sach, hoc sach
so sach » so sanh, bo sach, hoc sach
va cam » va cham, va cac, va cao
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) OR (co sach)) y ((nang ma) or (sang tao)) hoi. hieu va cam luc va hanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) y ((nang ma) OR (sang tao)) hoi. hieu va cam luc va hanh dai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) y ((nang ma) or (sang tao)) hoi. hieu va cam luc va hanh dai su triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) y ((nang ma) or (sang tao)) hoi. hieu va cam luc va hanh dai su triet*.