Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan, thuc day
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hoc anh » hoc nganh, hoc nhanh, ngoc anh
cuu tre » cua tre, cau tren, cau treo
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) OR (hoc anh)) ky lang xa hoi. ((hieu va) or (lieu va)) am thuc va dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) ky lang xa hoi. ((hieu va) OR (lieu va)) am thuc va dan vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) ky lang xa hoi. ((hieu va) or (lieu va)) am thuc va dan vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc anh)) ky lang xa hoi. ((hieu va) or (lieu va)) am thuc va dan vai cuu tre*.