Perhaps you should try some spelling variations:
thieu hach » thien hach, hieu cach, thieu cac
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 (chieu sach)) - canh tranh cua ((nhung cong) OR (thong cong)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu hach) OR (chieu sach)) - canh tranh cua ((nhung cong) OR (thong cong)) dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) or (chieu sach)) - canh tranh cua ((nhung cong) OR (thong cong)) dan chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hach) or (chieu sach)) - canh tranh cua ((nhung cong) OR (thong cong)) dan chan cau*.