Perhaps you should try some spelling variations:
thien van » thi van
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
lang van » dang van, tang van, hoang van
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
lam duc » lam duoc, pham duc, nam duoc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((lang xa) or (lang van)) hoi. ((hieu va) or (thien van)) lam duc van thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (lang van)) hoi. ((hieu va) OR (thien van)) lam duc van thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (lang van)) hoi. ((hieu va) or (thien van)) lam duc van thanh tai cua tre*.