Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
thanh dao » thanh dat, thanh do, hanh dao
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
cau tre » cau tren, cau treo, cau tra
y nang » ky nang, v nang, may nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ly nang)) cao hoi. hieu van cac duc va ((thanh dao) OR (thanh dam)) cau tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (ly nang)) cao hoi. hieu van cac duc va ((thanh dao) OR (thanh dam)) cau tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (ly nang)) cao hoi. hieu van cac duc va ((thanh dao) OR (thanh dam)) cau tre*.