Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu khach » vu khanh, vu khac, vay khach
chat luc » chat xuc, chat lua, nhan luc
va thanh » gia thanh, va tinh, le thanh
co sach » bo sach, cuon sach, hoc sach
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
lai cua » dai cua, hai cua, lai chau
cua te » cua tu

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 (co sach)) ty xang xa hoi. hieu ve chat luc ((va thanh) OR (ban thanh)) lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (co sach)) ty xang xa hoi. hieu ve chat luc ((va thanh) OR (ban thanh)) lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (co sach)) ty xang xa hoi. hieu ve chat luc ((va thanh) OR (ban thanh)) lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (co sach)) ty xang xa hoi. hieu ve chat luc ((va thanh) OR (ban thanh)) lai cua te*.