Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
hanh di » hanh de, hang di, danh di
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
hoc anh » hoc nganh, hoc nhanh, ngoc anh
luc va » duc va, tuc va, loc va
va cam » va cham, va cac, va cao

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