Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
me hoi » le hoi
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
vai va » mai va, dai va, hai va

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