Perhaps you should try some spelling variations:
doanh dao » doanh bao, doanh cao, doanh giao
van doanh » toan doanh, van dong, van thanh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cac toc » cac toi, cac nuoc, cac thoi
dao cua » dai cua, day cua, dan cua
cac tuc » cac tu, cac tac, cac nuoc
ky lang » ky dang, ky tang, tay lang
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: te sach ((ky lang) or (ky nang)) xa hoi. hieu van ((cac tuc) OR (cac toc)) van doanh dao cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky nang)) xa hoi. hieu van ((cac tuc) OR (cac toc)) van doanh dao cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) or (ky nang)) xa hoi. hieu van ((cac tuc) OR (cac toc)) van doanh dao cua te*".