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 loc » cac lop, cac toc, cac hoc
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
thu san » thuy san, thu ban, phu san
loc va » hoc va, luc va
tu san » tu ban, tu can, vu san

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 xa hoi. hieu van cac loc 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 xa hoi. hieu van cac loc va hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (thu san)) ky nang xa hoi. hieu van cac loc va hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (thu san)) ky nang xa hoi. hieu van cac loc va hanh vi ((cua tre) OR (cuu tre))*.