Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hiem ngan » kim ngan
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
van thanh » ban thanh, van tuan
ban than » ban thanh, ban hang, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hiem ngan) or (viem gan)) - thanh trung cua thong cong ((ban than) OR (van thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (viem gan)) - thanh trung cua thong cong ((ban than) OR (van thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hiem ngan) or (viem gan)) - thanh trung cua thong cong ((ban than) OR (van thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) or (viem gan)) - thanh trung cua thong cong ((ban than) OR (van thanh)) cau*.