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
thu san » thuy san, thu ban, phu san
lop va » lap va, hop va, nop va
tu san » tu ban, tu can, vu san
x hoi » xa hoi, o hoi, x ho

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 san)) ky nang x 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 san)) ky nang x 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 san)) ky nang x hoi. hieu van cac lop va hanh vi ((cua tre) or (cuu tre))*.