Perhaps you should try some spelling variations:
thanh van » thanh toan, thanh phan, thanh nhan
chet duoc » che duoc, cho duoc, che quoc
te sach » toc sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
va chet » va chiet, va che, va chat
duoc va » nuoc va, duc va, duoc ma
co hoi » co hoc, co loi
cua tu » cua tuc, cua su, cua cu
o hoi » o hoc, o hai, o hoa

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 lo nang ((o hoi) OR (co hoi)). lieu va chet duoc va ((thanh van) or (thanh san)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach lo nang ((o hoi) OR (co hoi)). lieu va chet duoc va ((thanh van) OR (thanh san)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach lo nang ((o hoi) OR (co hoi)). lieu va chet duoc va ((thanh van) or (thanh san)) cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach lo nang ((o hoi) OR (co hoi)). lieu va chet duoc va ((thanh van) or (thanh san)) cua tu*.