Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
cam tuc » cam tu, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((cao hoi) or (cao hoc)). hieu ve ((cam tuc) OR (cam xuc)) va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((cao hoi) OR (cao hoc)). hieu ve ((cam tuc) OR (cam xuc)) va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((cao hoi) or (cao hoc)). hieu ve ((cam tuc) OR (cam xuc)) va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((cao hoi) or (cao hoc)). hieu ve ((cam tuc) OR (cam xuc)) va hanh vi luu tre*.