Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
cua dang » cua cong, cua ban
chat xuc » chat huu, cam xuc, chat cua
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
hoc anh » hoc nganh, hoc nhanh, ngoc anh
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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)) cua dang xa hoi. hieu va ((chat xuc) or (chao xu)) va dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) cua dang xa hoi. hieu va ((chat xuc) OR (chao xu)) va dan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) cua dang xa hoi. hieu va ((chat xuc) or (chao xu)) va dan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc anh)) cua dang xa hoi. hieu va ((chat xuc) or (chao xu)) va dan vi cua tre*.