Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nay thuc » nam thuc, cay thuc, day thuc
cau treo » cau theo, cau triet, cau trieu
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
dao vai » dao van, dao bai, dao hai
ky dang » ky nang, ky danh
va nay » va ngay, va cay
dao va » dao van, tao va, do 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 ky dang xa hoi. hieu va nay thuc va ((dao vai) or (dao va)) ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu va nay thuc va ((dao vai) OR (dao va)) ((cau treo) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. hieu va nay thuc va ((dao vai) or (dao va)) ((cau treo) or (cau tren))*.