Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh trinh » canh tranh, hanh chinh
hiem ngan » kim ngan, viem gan
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
hoc hiem » hoc hien, hoc thieu, hoc thiet
cong tap » cuong tap, cong tac, cong tan
toan cau » toan ban, toan tap, toan tai
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 hiem ngan - hanh trinh cua thong cong tap ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hiem ngan - hanh trinh cua thong cong tap ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc hiem ngan - hanh trinh cua thong cong tap ((toan cau) or (toan cao))*.