Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, chau tinh, kieu tinh
luan chung » luan chinh
lieu tinh » trieu tinh, diep tinh, bien tinh
trinh san » trinh han, trinh quan, trinh toan
cua nhung » va nhung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: theo ((chieu tinh) OR (lieu tinh)) - trinh san ((cua nhung) or (luan chung)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu tinh) OR (lieu tinh)) - trinh san ((cua nhung) OR (luan chung)) cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu tinh) OR (lieu tinh)) - trinh san ((cua nhung) or (luan chung)) cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu tinh) OR (lieu tinh)) - trinh san ((cua nhung) or (luan chung)) cong tac toan cau*.