Perhaps you should try some spelling variations:
tieu trinh » tien trinh, tien thinh, trieu tinh
tieu tinh » trieu tinh, lieu tinh, kieu tinh
hanh dung » thanh dung, anh dung, hanh dong
cua thong » cua thuong, cua khong, cua tong
dung cua » dung luan, dung cho
tap toan » tap quan, bai toan
tap doan » tap quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((tieu tinh) or (tieu trinh)) - hanh dung cua thong thong ((tap toan) OR (tap doan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu tinh) OR (tieu trinh)) - hanh dung cua thong thong ((tap toan) OR (tap doan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu tinh) or (tieu trinh)) - hanh dung cua thong thong ((tap toan) OR (tap doan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu tinh) or (tieu trinh)) - hanh dung cua thong thong ((tap toan) OR (tap doan)) cau*.