Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
vanh tai » van tai, hanh tai, anh tai
van vanh » van anh, van hanh, van manh
cac cuoc » cac nuoc, ca cuoc, cac quoc
te sach » toc sach
tai cua » thai cua, tai cuc, tri cua
cac vuc » cac nuoc, cac vung, cac quoc
hieu ve » hieu va, hieu van
ma hoi » mai hoi, ma hoa, me hoi
cua tu » cua tuc, cua su, cua cu

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 thieu nang ((ma hoi) or (xa hoi)). hieu ve ((cac vuc) OR (cac cuoc)) van vanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thieu nang ((ma hoi) OR (xa hoi)). hieu ve ((cac vuc) OR (cac cuoc)) van vanh tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thieu nang ((ma hoi) or (xa hoi)). hieu ve ((cac vuc) OR (cac cuoc)) van vanh tai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach thieu nang ((ma hoi) or (xa hoi)). hieu ve ((cac vuc) OR (cac cuoc)) van vanh tai cua tu*.