Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh tai, hanh van
cam truc » cau truc, nam truc, lam truoc
hanh va » hang va, hanh vi
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
qua cam » qua cham, qua cac, qua ca
sach v » sach va, sach y, sach 2
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: su sach v nang ((mai hoi) or (dai hoi)). hieu qua cam truc va ((hanh vai) OR (hanh va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((mai hoi) OR (dai hoi)). hieu qua cam truc va ((hanh vai) OR (hanh va)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang ((mai hoi) or (dai hoi)). hieu qua cam truc va ((hanh vai) OR (hanh va)) cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((mai hoi) or (dai hoi)). hieu qua cam truc va ((hanh vai) OR (hanh va)) cua viet*.