Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
cong nguoi » con nguoi, long nguoi, song nguoi
cong nguon » luong nguon, cong nguyen, dung nguon
hoc thiet » hoc thieu, hoc thuyet, toc thieu
trinh cua » tinh cua, trinh luat, trinh quan
dan toan » van toan, dan than, 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: ((hoc thiet) or (hoc hien)) anh - hanh trinh cua ((cong nguoi) OR (cong nguon)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc hien)) anh - hanh trinh cua ((cong nguoi) OR (cong nguon)) dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) or (hoc hien)) anh - hanh trinh cua ((cong nguoi) OR (cong nguon)) dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (hoc hien)) anh - hanh trinh cua ((cong nguoi) OR (cong nguon)) dan toan cau*.