Perhaps you should try some spelling variations:
hai truc » dai truc, hai trac, hang truc
ban hanh » ban hang
van hanh » van thanh, van anh, van minh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va hai » van hai, va chai, va khai
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: su sach ky nang xa hoi. lieu va hai truc ((ban hanh) or (((van hanh) OR (van ban)))) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. lieu va hai truc ((ban hanh) OR (((van hanh) OR (van ban)))) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. lieu va hai truc ((ban hanh) or (((van hanh) OR (van ban)))) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. lieu va hai truc ((ban hanh) or (((van hanh) OR (van ban)))) vi cua tre*.