Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
su sach » so sach
vai cua » dai cua, hai cua, lai cua
dao vai » dao van, dao va, dao bai
cac tuc » cac toc, cac tu, cac tac
qua cac » cua cac
lang xa » lang ha, dang xay
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) y ((lang xa) or (lang van)) hoi. hieu qua cac tuc va dao vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y ((lang xa) OR (lang van)) hoi. hieu qua cac tuc va dao vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y ((lang xa) or (lang van)) hoi. hieu qua cac tuc va dao vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) y ((lang xa) or (lang van)) hoi. hieu qua cac tuc va dao vai cua tre*.