Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, hieu ve
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
hai cua » thai cua, dai cua, hoi cua
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: su sach y nang xa hoi. ((hieu van) OR (lieu va)) cam ((duc ban) or (duc van)) thanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu van) OR (lieu va)) cam ((duc ban) OR (duc van)) thanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu van) OR (lieu va)) cam ((duc ban) or (duc van)) thanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu van) OR (lieu va)) cam ((duc ban) or (duc van)) thanh hai cua te*.