Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van tuan » van quan, van ban, anh tuan
cua tre » cua te, cua triet, dua tren
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cuu tre » cau tren, cau treo
tu san » thu san, tu ban, tu can
loc va » hoc va, luc va
san ky » sang ky, van ky, dan ky
soc va » hoc va, doc va, goc va

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 ky lang xa hoi. hieu van tuan ((soc va) OR (loc va)) hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky lang xa hoi. hieu van tuan ((soc va) OR (loc va)) hanh vi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky lang xa hoi. hieu van tuan ((soc va) OR (loc va)) hanh vi ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu san ky lang xa hoi. hieu van tuan ((soc va) OR (loc va)) hanh vi ((cuu tre) or (cua tre))*.