Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nang mai » nang ma, nang tai, lang mai
chat tuc » chat xuc, luat tuc, chat huu
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vi va » vi van, vai va, vu va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (so sach)) ky nang mai hoi. ((hieu ve) or (hieu qua)) chat tuc va hanh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (so sach)) ky nang mai hoi. ((hieu ve) OR (hieu qua)) chat tuc va hanh vi va thiet.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (so sach)) ky nang mai hoi. ((hieu ve) or (hieu qua)) chat tuc va hanh vi va thiet*.