Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
va duong » van duong, va tuong, va huong
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va dung » van dung, vat dung, va ung
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 ((lang van) OR (dang van)) hoi. hieu va cac tuc ((va dung) or (va duong)) tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay ((lang van) OR (dang van)) hoi. hieu va cac tuc ((va dung) OR (va duong)) tai cuc te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay ((lang van) OR (dang van)) hoi. hieu va cac tuc ((va dung) or (va duong)) tai cuc te*".