Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
nang cau » hang cau, nang dau, bang cau
cham tuc » nham thuc, pham thuc, tham thuc
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
sach ky » sac ky, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
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: su ((sach ky) or (sach y)) ((nang cau) OR (nang cao)) hoi. hieu va cham tuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((nang cau) OR (nang cao)) hoi. hieu va cham tuc va hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) ((nang cau) OR (nang cao)) hoi. hieu va cham tuc va hanh vai cua tre*".