Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hanh hai » nhanh hai, hang hai, hanh tai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van coc » van hoc, van loc, van co
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
luc va » duc va, tuc va, loc va

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