Perhaps you should try some spelling variations:
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
vu khach » vu khanh, vu khac, vay khach
thi nang » thi cong, ki nang, thi hanh
vu sach » vu bach, su sach
vuc van » duc van, luc van, thuc van
nang ro » nang co, nang ho, nang ra
ca viet » va viet, co viet, hoa viet
ve cam » ve cham, ve cac, va cam
ro hoi » co hoi, o hoi, mo hoi
vi ca » vit ca, li ca, va ca

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)) thi nang ro hoi. hieu ((ve cam) or (van chat)) vuc van hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) thi nang ro hoi. hieu ((ve cam) OR (van chat)) vuc van hanh vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) thi nang ro hoi. hieu ((ve cam) or (van chat)) vuc van hanh vi ca viet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) thi nang ro hoi. hieu ((ve cam) or (van chat)) vuc van hanh vi ca viet*.