Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, vuc van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, ma hoa, me hoi
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky tang ((ma hoi) or (xa hoi)). hieu van cam xuc van hanh tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky tang ((ma hoi) OR (xa hoi)). hieu van cam xuc van hanh tai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: hoc sach ky tang ((ma hoi) or (xa hoi)). hieu van cam xuc van hanh tai ((cua te) or (cua tu))*.