Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu ha » hieu hoa, hieu va, hieu ca
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan tai, dan vat, den vai
dan va » doan va, dan ca, ban va
ha am » hoa am, ha nam, ha lam

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 ty lang xa hoi. hieu ha am thuc va ((dan vai) or (dan va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang xa hoi. hieu ha am thuc va ((dan vai) OR (dan va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang xa hoi. hieu ha am thuc va ((dan vai) or (dan va)) cau tren*.