Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
tranh thai » trang thai, tran thi, tinh thai
thanh toan » thanh hoa, thanh san, tinh toan
hoc thieu » toc thieu, hoc hien
thai dung » thai duong, thai vung, thi dung
dung cong » dung trong
bai toan » bai tap
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: hoc thieu tinh - canh tranh thai dung cong ((((bai toan) or (tap doan))) or (thanh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - canh tranh thai dung cong ((((bai toan) OR (tap doan))) OR (thanh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - canh tranh thai dung cong ((((bai toan) or (tap doan))) or (thanh toan)) cau*.