Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
van hang » van khang, van hoang, van thang
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
hai cua » thai cua, dai cua, hoi cua
cam duc » cam xuc, pham duc, nam duoc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
cua te » cua tu

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

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