Perhaps you should try some spelling variations:
thien van » thi van
day thanh » dao thanh, dat thanh, da thanh
hieu van » hieu va, lieu va, hieu ve
thanh va » thanh van, hanh va, thanh ha
te sach » toc sach
sach ky » sac ky, sach y, sach ty
chat tu » nhat tu, chai tu, chay tu
dau tre » dau tren, dau tien, cau tren
tu day » tu duy, tu dat, tu cay
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x ho. ((hieu van) or (thien van)) chat tu day thanh va dau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x ho. ((hieu van) OR (thien van)) chat tu day thanh va dau tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x ho. ((hieu van) or (thien van)) chat tu day thanh va dau tre*.