Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
qua cham » qua hai, qua cac, va cham
cua viet » ca viet, cua vat, cua dieu
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
so sanh » do sanh
dai hoi » dai hai, dai moi
sanh v » sanh va, canh v, sanh _
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 sanh v nang ((dai hoi) OR (dai hoc)). hieu qua cham truc va hanh vai ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh v nang ((dai hoi) OR (dai hoc)). hieu qua cham truc va hanh vai ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh v nang ((dai hoi) OR (dai hoc)). hieu qua cham truc va hanh vai ((cua viet) or (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: so sanh v nang ((dai hoi) OR (dai hoc)). hieu qua cham truc va hanh vai ((cua viet) or (hoa viet))*.