Perhaps you should try some spelling variations:
thi hang » thi hanh, thi hong, thi thanh
thi nang » thi cong, ki nang, thi hanh
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
te sach » toc sach
van bac » van ban, van bao, van hac
bac luc » bao luc
cua tre » cua te, cuu tre, cua triet
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 hang) OR (thi nang)) x hoi. hieu van bac luc va thanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((thi hang) OR (thi nang)) x hoi. hieu van bac luc va thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((thi hang) OR (thi nang)) x hoi. hieu van bac luc va thanh di cua tre*.