Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
thanh vi » hanh vi, thanh va, thanh ve
thuc ban » thuoc ban, thuc dan, thu ban
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
va am » va lam, va cam

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