Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
manh hung » anh huong
trong bai » trong ban, thong bai, trong hai
cua dang » cua ban
bai toan » bai tap
toan cau » 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 thieu xanh - manh hung ((cua dang) OR (cua cong)) trong bai toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - manh hung ((cua dang) OR (cua cong)) trong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - manh hung ((cua dang) OR (cua cong)) trong bai toan cau*.