Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
thanh tien » thanh vien, thanh nien, thang tien
hoat luong » chat luong, hoat dong, cat luong
doi chieu » doc hieu, doi chi, ho chieu
hoc luong » hoc thuong, hoc phuong, hoc truong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan tap » toan ban

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu tinh - thanh tien ((hoat luong) OR (hoc luong)) cong tap toan tap~".
• Adding a wildcard symbol may retrieve word variants: doi chieu tinh - thanh tien ((hoat luong) OR (hoc luong)) cong tap toan tap*.