Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
te sach » toc sach
van hoi » van hoa, van hoc, van loi
van hoe » van hoa, van hoc, van hieu
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cua te, cuu tre, cua triet
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) OR (van hoe)). hieu vu 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) OR (van hoe)). hieu vu 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) OR (van hoe)). hieu vu cham duc va ((hanh vi) or (dinh vi)) cua tre*".