Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham soc » cham soc, tham nuoc, thai son
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
soc ban » hoc ban, coc ban, so ban
vai cua » hai cua, lai cua, bai cua
x hoi » xa hoi, o hoi, 5 hoi

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 ly nang ((x hoi) or (x ho)). hieu van tham soc ban thanh ((vai cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((x hoi) OR (x ho)). hieu van tham soc ban thanh ((vai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang ((x hoi) or (x ho)). hieu van tham soc ban thanh ((vai cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((x hoi) or (x ho)). hieu van tham soc ban thanh ((vai cua) OR (dai cua)) te*.