Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, lieu tinh, kieu tinh
tranh cua » manh cua
doanh cua » doanh luan
doc hieu » toc thieu, hoc thieu, hoc hien
song tam » dong tam, duong tam, dong tai
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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) or (doanh cua)) bang ((song tam) OR (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - canh ((tranh cua) OR (doanh cua)) bang ((song tam) OR (cong tac)) toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - canh ((tranh cua) or (doanh cua)) bang ((song tam) OR (cong tac)) toan cau*".