Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
hieu van » thien van, lieu va, hieu ve
cam tuc » cam xuc, cam tu, nam thuc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa

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) or (thuat sach)) ky nang xa hoi. ((hieu van) or (hieu va)) cam tuc va hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang xa hoi. ((hieu van) OR (hieu va)) cam tuc va hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang xa hoi. ((hieu van) or (hieu va)) cam tuc va hanh vai cua viet*.