Perhaps you should try some spelling variations:
thi nang » thi cong, ki nang, thi hanh
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
hieu va » lieu va, hieu qua
bac luc » bao luc
cua tre » cua te, cuu tre, cua triet
va bac » van bac, va cac, va bai
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((thi thanh) or (thi nang)) x hoi. hieu va bac luc va thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thi thanh) OR (thi nang)) x hoi. hieu va bac luc va thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((thi thanh) or (thi nang)) x hoi. hieu va bac luc va thanh di cua tre*.