Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
nam duoc » nam thuoc, da duoc, dat duoc
su sach » so sach, vu sach
cao duc » dao duc, cao suc, giao duc
hai cua » thai cua, dai cua, hoi cua
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hang » van hang, va nang, va lang
y nang » ky nang, ly nang, v nang
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 sach) or (te sach)) y nang xa hoi. hieu ve ((nam duoc) or (cao duc)) va hang hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) y nang xa hoi. hieu ve ((nam duoc) OR (cao duc)) va hang hai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) y nang xa hoi. hieu ve ((nam duoc) or (cao duc)) va hang hai cua tu*.