Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hiem ngan » kim ngan
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (viem gan)) - hanh trang va nhung cong dan ((than cao) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hiem ngan) OR (viem gan)) - hanh trang va nhung cong dan ((than cao) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) OR (viem gan)) - hanh trang va nhung cong dan ((than cao) or (toan cao))*.