Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
sach tay » xach tay, sach hay, sach nay
cac toc » cac toi, cac nuoc, cac thoi
tai cua » thai cua, tai cuc, tri cua
va dung » van dung, va duong, vat dung
hieu va » lieu va, hieu qua
cac tuc » cac tu, cac tac, cac nuoc
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tay ((lang van) or (tang van)) hoi. hieu va ((cac tuc) OR (cac toc)) va dung tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tay ((lang van) OR (tang van)) hoi. hieu va ((cac tuc) OR (cac toc)) va dung tai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tay ((lang van) or (tang van)) hoi. hieu va ((cac tuc) OR (cac toc)) va dung tai cua te*".