Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
tranh su » trinh su, tranh cua, trang suc
trang su » trang suc, trong su, tang su
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 hien xanh - canh ((tranh su) OR (trang su)) dung cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - canh ((tranh su) OR (trang su)) dung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh ((tranh su) OR (trang su)) dung cong tac toan cau*.