Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
te sach » toc sach
ly hang » ly quang
ty nang » ky nang, ty xang, ty hang
va cua » va chua, via cua, ca cua
cua te » cua tu
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 ((ty nang) or (ly hang)) x hoi. hieu van cau duc ((va thanh) OR (ban thanh)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ly hang)) x hoi. hieu van cau duc ((va thanh) OR (ban thanh)) va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) or (ly hang)) x hoi. hieu van cau duc ((va thanh) OR (ban thanh)) va cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ly hang)) x hoi. hieu van cau duc ((va thanh) OR (ban thanh)) va cua te*.