Perhaps you should try some spelling variations:
khong xuong » khong dung, hong vuong, thong duong
toan khong » toan thong, toan khung, toan thuong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
anh xuan » anh quan, thanh xuan, anh xquang
xuong bi » uong bi, muong bi, truong bi
toan cao » toan ban, toan tap
bi toan » bai toan, boi toan, bi tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chinh sach - ((anh xuan) or (anh tuan)) toan khong xuong bi toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - ((anh xuan) OR (anh tuan)) toan khong xuong bi toan cao*.