Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
vu khach » vu khanh, vu khac, vay khach
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
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: ((vu khach) or (tu sach)) ky nang xa hoi. lieu va cham thuc ban hanh ((vai cua) OR (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (tu sach)) ky nang xa hoi. lieu va cham thuc ban hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (tu sach)) ky nang xa hoi. lieu va cham thuc ban hanh ((vai cua) OR (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (tu sach)) ky nang xa hoi. lieu va cham thuc ban hanh ((vai cua) OR (hai cua)) tre*.