Perhaps you should try some spelling variations:
trong van » trong cac
vu khach » vu khanh, vu khac, vay khach
khach ty » sach ty
thanh vi » hanh vi, thanh va, thanh ve
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
su tien » su kien, su hien, tu tieng
vi su » va su, ve su, ki su

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 ty ((trong van) or (mang may)) hoi. hieu ve ((cam duc) OR (pham duc)) gia thanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ty ((trong van) OR (mang may)) hoi. hieu ve ((cam duc) OR (pham duc)) gia thanh vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ty ((trong van) or (mang may)) hoi. hieu ve ((cam duc) OR (pham duc)) gia thanh vi su tien".
• Adding a wildcard symbol may retrieve word variants: vu khach ty ((trong van) or (mang may)) hoi. hieu ve ((cam duc) OR (pham duc)) gia thanh vi su tien*.