Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
canh manh » lanh manh, canh tranh, cach mang
tong cong » trong cong, dung cong, dang cong
cong cong » cong dong, trong cong, dung cong
ho chieu » theo chieu, doi chieu, mot chieu
manh cua » doanh cua, ban cua
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - canh manh cua ((tong cong) OR (cong cong)) dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh manh cua ((tong cong) OR (cong cong)) dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - canh manh cua ((tong cong) OR (cong cong)) dan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - canh manh cua ((tong cong) OR (cong cong)) dan phan cau*.