Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
dai huu » dao huu, dai hau, dai thua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
huu tre » huu tri, cuu tre, huu them
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky

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 (sac ky)) dang ((ma hoi) or (mai hoi)). hieu van cam tuc va hanh dai huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) dang ((ma hoi) OR (mai hoi)). hieu van cam tuc va hanh dai huu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) dang ((ma hoi) or (mai hoi)). hieu van cam tuc va hanh dai huu tre*.