Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
hach toan » thanh toan, manh toan
tranh su » trinh su, tranh cua, trang suc
trang su » trang suc, trong su, tang su
tac toan » tap toan, tam toan, tich toan

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 - canh ((tranh su) OR (trang su)) dung cong ((tac toan) or (hach toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh ((tranh su) OR (trang su)) dung cong ((tac toan) OR (hach toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh ((tranh su) OR (trang su)) dung cong ((tac toan) or (hach toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((tranh su) OR (trang su)) dung cong ((tac toan) or (hach toan)) cao*.