Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tuan doc » than doc, tuan do, thuat doc
quan doc » quan doi, quan dac, quan doan
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cuu tre » cau tren, cau treo
te ban » te bao
ban ky » van ky, dan ky

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

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