Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va dung » van dung, va duong, vat dung
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
nam tu » nam thu, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ma hoa. ((hieu ve) or (lieu va)) nam tu va dung tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoa. ((hieu ve) OR (lieu va)) nam tu va dung tai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ma hoa. ((hieu ve) or (lieu va)) nam tu va dung tai cua tre*.