Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va hang » van hang, va nang, va lang
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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) or (v nang)) x hoi. hieu ve ((cam xuc) or (cao duc)) va hang hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) x hoi. hieu ve ((cam xuc) OR (cao duc)) va hang hai cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) x hoi. hieu ve ((cam xuc) or (cao duc)) va hang hai cua tu*.