Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va
ky tang » ky nang, ky dang, ky trong
cam duc » cam xuc, cao duc, pham duc
su cac » tu cac, su cao, su can
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ((ky tang) OR (kho tang)) xa hoi. ((hieu ve) or (hieu van)) cam duc ban thanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ((ky tang) OR (kho tang)) xa hoi. ((hieu ve) OR (hieu van)) cam duc ban thanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ((ky tang) OR (kho tang)) xa hoi. ((hieu ve) or (hieu van)) cam duc ban thanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: su cac ((ky tang) OR (kho tang)) xa hoi. ((hieu ve) or (hieu van)) cam duc ban thanh hai cua te*.