Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cham oc » cham soc, cham hoi, cham voi
ky lang » ky nang, ky tang, tay lang
vai cua » dai cua, hai cua, lai cua
ky dang » ky nang, ky danh
cham o » cham soc
su sac » su sach, su cac, su xac
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ky lang) or (ky dang)) ha noi. hieu van ((cham oc) OR (cham o)) van hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky lang) OR (ky dang)) ha noi. hieu van ((cham oc) OR (cham o)) van hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky lang) or (ky dang)) ha noi. hieu van ((cham oc) OR (cham o)) van hanh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky lang) or (ky dang)) ha noi. hieu van ((cham oc) OR (cham o)) van hanh vai cua tu*.