Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
hang hai » hoang hai, thanh hai, hang va
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
xac ky » cac ky, sac ky, bac ky
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang xa hoi. hieu va ((cam duc) or (cao duc)) ban ((hang hai) OR (hang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang xa hoi. hieu va ((cam duc) OR (cao duc)) ban ((hang hai) OR (hang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang xa hoi. hieu va ((cam duc) or (cao duc)) ban ((hang hai) OR (hang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang xa hoi. hieu va ((cam duc) or (cao duc)) ban ((hang hai) OR (hang tai)) cua tre*.