Perhaps you should try some spelling variations:
sach tay » xach tay, sach nay, sach tai
sach hay » sach han, sach ha, sach nay
tang van » dang van, hoang van, trong van
van hoi » van hoa, van hoc, van hoe
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
va dung » van dung, va duong, vat dung
cuc te » cua te, cuc thue, cuc tieu

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 tay) OR (sach hay)) tang van hoi. lieu va ((cac tuc) or (cac toc)) va dung tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tay) OR (sach hay)) tang van hoi. lieu va ((cac tuc) OR (cac toc)) va dung tai cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tay) OR (sach hay)) tang van hoi. lieu va ((cac tuc) or (cac toc)) va dung tai cuc te*".