Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc khien » hoc hien, hoc nghien, hoc vien
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
trong huy » trong thuy, trong hue, trang huy
cua dung » cua dang, cua dong, qua dung
huy toan » huy tran, huu toan, huy hoang
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: ((hoc khien) or (hoc thieu)) tinh - hanh tranh cua dung trong huy toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc khien) OR (hoc thieu)) tinh - hanh tranh cua dung trong huy toan cao*.