Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc hien, toc thieu
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
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 thuyet)) tach - hanh trinh cua ((thong cong) or (dung cong)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) tach - hanh trinh cua ((thong cong) OR (dung cong)) dan toan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (hoc thuyet)) tach - hanh trinh cua ((thong cong) or (dung cong)) dan toan cau*.