Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
nang cai » nang cao, nang tai, nang cap
hieu van » thien van, lieu va, hieu ve
xa thanh » va thanh, ha thanh, ta thanh
sach ky » sac ky, sach y, sach ty
cai hoa » cau hoa, cam hoa, dai hoa
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 nang cai hoa. ((hieu van) or (hieu va)) cam tuc xa thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang cai hoa. ((hieu van) OR (hieu va)) cam tuc xa thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang cai hoa. ((hieu van) or (hieu va)) cam tuc xa thanh tai cua tre*.