Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
ky dang » ky danh
van hac » van hoc, van ha, van hai
hac xuc » chat xuc
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
vu san » va san, vu ban
du cua » duy cua, dau cua, dum cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ((ky dang) or (ky nang)) xa hoi. hieu van hac xuc ((va hanh) OR (van hanh)) du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ((ky dang) OR (ky nang)) xa hoi. hieu van hac xuc ((va hanh) OR (van hanh)) du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ((ky dang) or (ky nang)) xa hoi. hieu van hac xuc ((va hanh) OR (van hanh)) du cua tre".
• Adding a wildcard symbol may retrieve word variants: vu san ((ky dang) or (ky nang)) xa hoi. hieu van hac xuc ((va hanh) OR (van hanh)) du cua tre*.