Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu
tong cong » trong cong, cong cong, dung cong
cong lang » cong vang, cong luong, cong quang
trinh ve » trinh he, trinh va, trinh vi
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
ve tong » ve tuong, ve trong, ve cong

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