Perhaps you should try some spelling variations:
thien van » thi van
xay hanh » day nhanh, day thanh, xanh hanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
chat tu » nhat tu, chai tu, chay tu
hanh va » hang va, hanh vi
dau tre » dau tren, dau tien, cau tren
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 ve) or (thien van)) chat tu xay hanh va dau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x ho. ((hieu ve) OR (thien van)) chat tu xay hanh va dau tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x ho. ((hieu ve) or (thien van)) chat tu xay hanh va dau tre*.