Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thu sac » thu sach, thu san, thu xac
qua ban » cua ban, qua quan
vai cua » dai cua, hai cua, lai cua
van cau » van dau, van hau, van chat
tao hoa » bao hoa, tao hoi, tao ho
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ((ky sang) OR (ky dang)) tao hoa. hieu van cau qua ban thanh ((vai cuu) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ((ky sang) OR (ky dang)) tao hoa. hieu van cau qua ban thanh ((vai cuu) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ((ky sang) OR (ky dang)) tao hoa. hieu van cau qua ban thanh ((vai cuu) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sac ((ky sang) OR (ky dang)) tao hoa. hieu van cau qua ban thanh ((vai cuu) or (vai cua)) tre*.