Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh do, thanh dinh
hieu van » hieu va, thien van, lieu va
thanh de » hanh de, thanh ve, thanh do
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
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 cac duc ban ((thanh di) or (thanh de)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van cac duc ban ((thanh di) OR (thanh de)) ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu van cac duc ban ((thanh di) or (thanh de)) ((cua tre) or (cuu tre))*.