Perhaps you should try some spelling variations:
thien van » thi van
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
cua viet » ca viet, hoa viet, cua vat
nam luc » nhan luc, nam thuc, nam duoc
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
co hoi » co loi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang ((co hoi) or (co hoc)). thien van ((nam luc) OR (nang luc)) van thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ((co hoi) OR (co hoc)). thien van ((nam luc) OR (nang luc)) van thanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang ((co hoi) or (co hoc)). thien van ((nam luc) OR (nang luc)) van thanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ((co hoi) or (co hoc)). thien van ((nam luc) OR (nang luc)) van thanh vi cua viet*.