Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
hieu tinh » chieu tinh, lieu tinh, kieu tinh
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
tuan cau » quan cau, tuan cu, thuan cam
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: doc hieu tinh - hanh trinh cua nhung cong san ((tuan cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - hanh trinh cua nhung cong san ((tuan cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh trinh cua nhung cong san ((tuan cau) or (toan cau))*.