Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
cam duc » cao duc, pham duc, nam duoc
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac

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 tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) or (cam xuc)) ban thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) OR (cam xuc)) ban thanh san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) or (cam xuc)) ban thanh san cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) or (cam xuc)) ban thanh san cua tre*.