Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach tay » xach tay, sach hay, sach nay
dua tren » dung tren
lang van » dang van, tang van, hoang van
hieu va » lieu va, hieu qua
cham tu » pham tu, cam tu, chai tu
cuu tre » cua tre, cau tren, cau treo
va cham » va chat, va tham
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tay ((lang van) or (hang va)) hoi. hieu va cham tu va dan va ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tay ((lang van) OR (hang va)) hoi. hieu va cham tu va dan va ((cuu tre) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: toc sach tay ((lang van) or (hang va)) hoi. hieu va cham tu va dan va ((cuu tre) or (dua tren))*.