Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
cuu tre » cau tren, cau treo
dan vai » dan tai, dan vat, den vai
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
thuc va » thuc vat, thuc dan, thuc day
hieu ha » hieu hoa, hieu va, hieu ca
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
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 ty lang xa hoi. hieu ha nam thuc va ((dan vai) or (dan va)) ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang xa hoi. hieu ha nam thuc va ((dan vai) OR (dan va)) ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty lang xa hoi. hieu ha nam thuc va ((dan vai) or (dan va)) ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang xa hoi. hieu ha nam thuc va ((dan vai) or (dan va)) ((cuu tre) OR (cua tre))*.