Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
ho chieu » theo chieu, hoc thieu, doi chieu
trang he » trong he, trang ha, tang he
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
khan ap » khan cap, han ap, khan dam

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 (ho chieu)) tach - hanh trang he thong cong tan ((than cau) or (khan ap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (ho chieu)) tach - hanh trang he thong cong tan ((than cau) OR (khan ap)).
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (ho chieu)) tach - hanh trang he thong cong tan ((than cau) or (khan ap))*.