Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
hai cuu » hai cua, hai chu, hai cuc
cuu tre » cua tre, cau tren, cau treo
y nang » ly nang, v nang, may nang

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 (ky nang)) xa hoi. hieu van cam ((duc ban) or (duc van)) thanh hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) xa hoi. hieu van cam ((duc ban) OR (duc van)) thanh hai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) xa hoi. hieu van cam ((duc ban) or (duc van)) thanh hai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ky nang)) xa hoi. hieu van cam ((duc ban) or (duc van)) thanh hai cuu tre*.