Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
cua viet » ca viet, hoa viet, cua dieu
hanh vai » hanh vi, hanh va, hanh tai
nang dai » nang dau, nang tai, lang dai
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
so sach » so sanh, co sach, hoc sach
qua cam » qua cham, qua cac, qua ca
dai moi » doi moi, dai hoi
bo sach » co sach, hoc sach
v nang » va nang, vu nang, van nang

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 (bo sach)) v nang dai moi. hieu qua cam truc va hanh vai ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) v nang dai moi. hieu qua cam truc va hanh vai ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) v nang dai moi. hieu qua cam truc va hanh vai ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) v nang dai moi. hieu qua cam truc va hanh vai ((cua viet) OR (cua vat))*.