Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
su sach » so sach, vu sach
cam thu » nam thu, cac thu, ca thu
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
cam tu » nam tu, dam tu, tam tu

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