Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lai » thanh hai, thanh lap, thanh loi
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
ca tren » cau tren, cu tren, la tren

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 ty lang xa hoi. ((hieu va) or (hieu qua)) cam tuc ban thanh lai ((cua tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. ((hieu va) OR (hieu qua)) cam tuc ban thanh lai ((cua tre) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. ((hieu va) or (hieu qua)) cam tuc ban thanh lai ((cua tre) or (ca tren))*.