Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
danh lai » danh sai, gianh lai, dinh lam
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet

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 sinh)) ty ((lang xa) or (dang xay)) hoi. hieu van lam duc va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ty ((lang xa) OR (dang xay)) hoi. hieu van lam duc va danh lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) ty ((lang xa) or (dang xay)) hoi. hieu van lam duc va danh lai cua tre*".