Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cam luc » cam xuc, cau luc
luc ban » duc ban, cuc ban, luc bat
va chua » vua chua, ca chua, va chu
y nang » ky nang, ly nang, v nang
ma cua » ca cua, manh cua, mang cua

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

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