Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
lang cong » dang cong, bang cong, hang cong
hach toan » thanh toan, manh toan
tranh va » tranh van, trang va, trinh va
tac toan » tap toan, tam toan, tich toan
va lang » va nang, hoa lang

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 va lang cong ((tac toan) OR (hach toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh tranh va lang cong ((tac toan) OR (hach toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh va lang cong ((tac toan) OR (hach toan)) cau*.