Perhaps you should try some spelling variations:
xuan truong » xa truong, duong truong
cua truong » cua trung, cac truong, xa truong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
hoc dieu » hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 dieu) or (ho chieu)) xanh - hanh tinh ((cua truong) OR (xuan truong)) cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc dieu) OR (ho chieu)) xanh - hanh tinh ((cua truong) OR (xuan truong)) cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc dieu) or (ho chieu)) xanh - hanh tinh ((cua truong) OR (xuan truong)) cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc dieu) or (ho chieu)) xanh - hanh tinh ((cua truong) OR (xuan truong)) cong tac toan cao*.