Perhaps you should try some spelling variations:
vu khach » vu khac, vay khach, cua khach
cham tuc » nham thuc, pham thuc, tham thuc
vu khanh » vu thanh, van khanh, duy khanh
thu nang » thi nang, thu hang, thu bang
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
hieu va » lieu va, hieu qua
va cham » va chat, va tham
lai cua » dai cua, hai cua, lai chau
x hoi » xa hoi, o hoi, x ho

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 (vu khanh)) thu nang x hoi. hieu va cham tuc ((va hanh) OR (van hanh)) lai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (vu khanh)) thu nang x hoi. hieu va cham tuc ((va hanh) OR (van hanh)) lai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (vu khanh)) thu nang x hoi. hieu va cham tuc ((va hanh) OR (van hanh)) lai cua vat".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (vu khanh)) thu nang x hoi. hieu va cham tuc ((va hanh) OR (van hanh)) lai cua vat*.