Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
van thanh » ban thanh, van tuan
thanh bac » nhanh bac, thanh bai, thanh san
hoi khoa » hoc khoa, noi khoa, tai khoa
cong van » cong vang, cong san, song van
hoi hoa » hoc hoa, hoi hoc, hoi ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoi hoa) OR (hoi khoa)) sinh - ((hanh tranh) or (hanh trinh)) va nhung cong van thanh bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoi hoa) OR (hoi khoa)) sinh - ((hanh tranh) OR (hanh trinh)) va nhung cong van thanh bac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoi hoa) OR (hoi khoa)) sinh - ((hanh tranh) or (hanh trinh)) va nhung cong van thanh bac".
• Adding a wildcard symbol may retrieve word variants: ((hoi hoa) OR (hoi khoa)) sinh - ((hanh tranh) or (hanh trinh)) va nhung cong van thanh bac*.