Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
dang xay » dang van, van xay
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
day dan » day danh, dao dan, cay dan
qua nam » quan nam, cua nam, quang nam
lang xa » lang ha, lang van
cuu tre » cua tre, cau tren, cau treo

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ky ((lang xa) OR (dang xay)) hoi. hieu qua nam thuc day dan vai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) ky ((lang xa) or (dang xay)) hoi. hieu qua nam thuc day dan vai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc sinh)) ky ((lang xa) or (dang xay)) hoi. hieu qua nam thuc day dan vai cuu tre*.