Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dao trang » dao trong, dao trung, do trang
van thanh » ban thanh, van tuan
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dao lang » dao khang, dao quang, dao van
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cac luc » cau luc, coc luc, cac cuoc
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((dao lang) or (dao trang)) xa hoi. hieu qua ((cac luc) OR (cac nuoc)) van thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((dao lang) OR (dao trang)) xa hoi. hieu qua ((cac luc) OR (cac nuoc)) van thanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((dao lang) or (dao trang)) xa hoi. hieu qua ((cac luc) OR (cac nuoc)) van thanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((dao lang) or (dao trang)) xa hoi. hieu qua ((cac luc) OR (cac nuoc)) van thanh vai cua te*.