Perhaps you should try some spelling variations:
truong toan » truong ton, trong toan, truong tan
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
luong toan » luong thanh, luong tai, luong tin
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, trinh han

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 - hanh ((trinh vat) OR (sinh vat)) nhung cong ((luong toan) or (truong toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((trinh vat) OR (sinh vat)) nhung cong ((luong toan) OR (truong toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh ((trinh vat) OR (sinh vat)) nhung cong ((luong toan) or (truong toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((trinh vat) OR (sinh vat)) nhung cong ((luong toan) or (truong toan)) cau*.