Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cac xuc » cac nuoc, chat xuc, cac cuoc
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
vi cua » vai cua, di cua
cua su » qua su

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 tu ((nang xa) or (nang x)) hoi. hieu ve ((cac xuc) OR (cam xuc)) van hanh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang xa) OR (nang x)) hoi. hieu ve ((cac xuc) OR (cam xuc)) van hanh vi cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((nang xa) or (nang x)) hoi. hieu ve ((cac xuc) OR (cam xuc)) van hanh vi cua su".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang xa) or (nang x)) hoi. hieu ve ((cac xuc) OR (cam xuc)) van hanh vi cua su*.