Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua viet » ca viet, hoa viet, cua vat
thanh va » thanh van, hanh va, thanh ha
hieu van » hieu va, thien van, lieu va
cham oc » cham o, cham hoi, cham voi
vu khac » vu kham, vu khanh, bui khac
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu khac)) y nang o hoi. hieu van ((cham oc) OR (cham soc)) van thanh va cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu khac)) y nang o hoi. hieu van ((cham oc) OR (cham soc)) van thanh va cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu khac)) y nang o hoi. hieu van ((cham oc) OR (cham soc)) van thanh va cua viet*.