Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
van lam » van nam
di cua » dai cua, doi cua, de cua
so sac » so sach, so dac
tuc va » truc va, tuc xa, duc va
sac ky » cac ky, sai ky
co hai » co dai, co hoi, o hai
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang ((o hoi) or (co hai)). hieu van lam ((tuc va) or (thuc va)) thanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang ((o hoi) OR (co hai)). hieu van lam ((tuc va) OR (thuc va)) thanh di cua te.
• Adding a wildcard symbol may retrieve word variants: so sac ky nang ((o hoi) or (co hai)). hieu van lam ((tuc va) or (thuc va)) thanh di cua te*.