Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
dung cong » dung trong
hinh cua » chinh cua, tinh cua, dinh cua
sinh cua » manh cua, dinh cuu, sinh va
cong san » cong tac
san toan » van toan, dan toan, manh toan
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 - hanh ((hinh cua) OR (sinh cua)) dung cong san toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((hinh cua) OR (sinh cua)) dung cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((hinh cua) OR (sinh cua)) dung cong san toan cao*.