Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
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 san » cong tac
san toan » van toan, dan toan, manh 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: ((theo tieu) or (hoc thieu)) xanh - hanh ((trinh cua) OR (tinh cua)) tong cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (hoc thieu)) xanh - hanh ((trinh cua) OR (tinh cua)) tong cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (hoc thieu)) xanh - hanh ((trinh cua) OR (tinh cua)) tong cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (hoc thieu)) xanh - hanh ((trinh cua) OR (tinh cua)) tong cong san toan cau*.