Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hiem ngan » kim ngan, viem gan
dong cong » duong cong, dung cong, dang cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
dung cua » dung luan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hiem ngan) or (chieu tinh)) - nhanh ((dung cua) OR (dung cho)) dong cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hiem ngan) OR (chieu tinh)) - nhanh ((dung cua) OR (dung cho)) dong cong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hiem ngan) or (chieu tinh)) - nhanh ((dung cua) OR (dung cho)) dong cong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: doi ((hiem ngan) or (chieu tinh)) - nhanh ((dung cua) OR (dung cho)) dong cong manh toan ban*.