Perhaps you should try some spelling variations:
thien van » thi van
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
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 ban » duc tan, duc van, dua ban
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 ban 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 ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) OR (lang van)) hoi. ((hieu va) or (thien van)) lam duc ban 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 ban thanh tai cua tre*.