Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhung cong » dung cong, hang cong, nhung don
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
toan cau » toan cao, toan ban, toan tai
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: doc hieu tinh - canh tranh cua ((nhung cong) or (thong cong)) dan ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - canh tranh cua ((nhung cong) OR (thong cong)) dan ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - canh tranh cua ((nhung cong) or (thong cong)) dan ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - canh tranh cua ((nhung cong) or (thong cong)) dan ((toan cau) OR (toan tap))*.