Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
cham duc » pham duc, cham soc, pham duy
te sach » toc sach
hieu va » lieu va, hieu qua
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu ve, hieu su, dieu vu
van hoi » van hoa, van hoc, van hoe
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach o lang van hoi. ((hieu vu) OR (hieu va)) cham duc va ((hanh vi) or (dinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o lang van hoi. ((hieu vu) OR (hieu va)) cham duc va ((hanh vi) OR (dinh vi)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o lang van hoi. ((hieu vu) OR (hieu va)) cham duc va ((hanh vi) or (dinh vi)) cua tre*".