Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang xa hoi. hieu van cam xuc va hanh vi ((dua tren) or (((cua te) OR (cua tu))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu van cam xuc va hanh vi ((dua tren) OR (((cua te) OR (cua tu)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van cam xuc va hanh vi ((dua tren) or (((cua te) OR (cua tu))))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van cam xuc va hanh vi ((dua tren) or (((cua te) OR (cua tu))))*.