Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trinh cua » trinh luat, trinh quan, trinh luan
tong cong » trong cong, cong cong, dung cong
tinh cua » sinh cua, tinh chat, tranh cua
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu xanh - hanh ((trinh cua) OR (tinh cua)) tong cong tap toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - hanh ((trinh cua) OR (tinh cua)) tong cong tap toan tap*".