Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
so sach » so sanh, bo sach, co sach
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
van cam » van nam, van lam, van cau
ty nang » ky nang, ty xang, ty hang
co hoi » co hoc, co loi
tuc va » truc va, tuc xa, duc va
di cua » dai cua, doi cua, de cua
cua te » cua tu
o hoi » o hoc, o hai, o hoa

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

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