Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh do, thanh dinh
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
thanh de » hanh de, thanh ve, thanh do
cuu tre » cua tre, cau tren, cau treo
van coc » van hoc, van loc, van co
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang xa hoi. hieu van coc luc va ((thanh di) OR (thanh de)) ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van coc luc va ((thanh di) OR (thanh de)) ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu van coc luc va ((thanh di) OR (thanh de)) ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu van coc luc va ((thanh di) OR (thanh de)) ((dua tren) or (cuu tre))*.