Perhaps you should try some spelling variations:
thieu hach » chieu sach, hieu cach, thieu cac
thien hach » thien thanh, hien hanh
nhung cong » thong cong, hang cong, nhung don
tranh cua » doanh cua, manh cua
dung cong » dung trong
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu hach) or (thien hach)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu hach) OR (thien hach)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) or (thien hach)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hach) or (thien hach)) - canh tranh cua ((nhung cong) OR (dung cong)) dan toan tap*.