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
van dung » van dong, xay dung
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
tai cua » thai cua, tai cuc, tri cua
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: tu sach tay ((lang van) or (dang van)) hoi. hieu va cac tuc ((van dung) OR (tin dung)) tai cua 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 ((van dung) OR (tin dung)) tai cua 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 ((van dung) OR (tin dung)) tai cua te*".