Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hanh dum » hanh dua, thanh dam, hanh dung
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach
dum cua » duy cua, dam cua, dung cua
lo vang » lo van, ly vang, hoa vang
vang xa » lang xa, mang xa, ang xa
tuc van » thuc van, truc van, tuc va
va cam » va cham, va cao, va cai
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 sach) or (vu khach)) lo vang xa hoi. hieu ((va cam) OR (va cac)) tuc van hanh dum cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) lo vang xa hoi. hieu ((va cam) OR (va cac)) tuc van hanh dum cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) lo vang xa hoi. hieu ((va cam) OR (va cac)) tuc van hanh dum cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) lo vang xa hoi. hieu ((va cam) OR (va cac)) tuc van hanh dum cua te*.