Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua

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

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