Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
vu khach » vu khanh, vu khac, vay khach
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
vai cua » dai cua, hai cua, lai cua
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
tu sach » thu sach, su sach, te sach

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 cham thuc ban hanh vai 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 cham thuc ban hanh vai 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 cham thuc ban hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (tu sach)) ky ((nang xa) OR (nang ma)) hoi. lieu va cham thuc ban hanh vai cua tre*.