Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hanh dai » hanh tai, hanh dao, vanh dai
cuu tre » cua tre, cau treo
va hanh » van hanh, va thanh, va danh
te sach » toc sach
hieu va » hieu qua
cac luc » cau luc, coc luc, cac nuoc
luc va » duc va, tuc va, loc va
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 thu nang x hoi. ((hieu va) or (lieu va)) cac luc va hanh dai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang x hoi. ((hieu va) OR (lieu va)) cac luc va hanh dai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang x hoi. ((hieu va) or (lieu va)) cac luc va hanh dai ((cuu tre) OR (cau tren))*".