Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
dung cong » dung trong
tinh cua » trinh cua, sinh cua, tinh chat
cua dung » cua dang, cua dong, qua dung
tap toan » tap doan, tap quan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - hanh tinh cua dung cong ((tap toan) OR (bai toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh tinh cua dung cong ((tap toan) OR (bai toan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh tinh cua dung cong ((tap toan) OR (bai toan)) cao*.