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