Perhaps you should try some spelling variations:
ban thanh » ban hang
cham thuc » nham thuc, pham thuc, tham thuc
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
vu khac » vu kham, vu khanh, bui khac
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khac) or (thu sach)) ky nang xa hoi. lieu va cham thuc ((ban thanh) OR (ban hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khac) OR (thu sach)) ky nang xa hoi. lieu va cham thuc ((ban thanh) OR (ban hanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khac) or (thu sach)) ky nang xa hoi. lieu va cham thuc ((ban thanh) OR (ban hanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khac) or (thu sach)) ky nang xa hoi. lieu va cham thuc ((ban thanh) OR (ban hanh)) vi cua tre*.