Perhaps you should try some spelling variations:
vu khach » vu khanh, vay khach, cua khach
van hanh » van thanh, ban hanh, van anh
van nang » van quang, van ban, van dong
truc van » truc va, thuc van, truc ban
ve cham » va cham, ve chat, vu cham
kem cua » em cua, keo cua, diem cua
cua tre » cua te, cuu tre, cua triet
vu khac » vu kham, vu khanh, bui khac
ve cam » ve cac, va cam, ve cai
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 khac)) van nang x hoi. hieu ((ve cam) OR (ve cham)) truc van hanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (vu khac)) van nang x hoi. hieu ((ve cam) OR (ve cham)) truc van hanh kem cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (vu khac)) van nang x hoi. hieu ((ve cam) OR (ve cham)) truc van hanh kem cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (vu khac)) van nang x hoi. hieu ((ve cam) OR (ve cham)) truc van hanh kem cua tre*.