Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cac lop » cac hop, cac loai
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
thu ban » thu hang
lop va » lap va, hop va, nop va
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu san) or (thu ban)) ky nang xa hoi. hieu van cac lop va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu san) OR (thu ban)) ky nang xa hoi. hieu van cac lop va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (thu ban)) ky nang xa hoi. hieu van cac lop va hanh vi ((cua tre) or (cuu tre))*.