Perhaps you should try some spelling variations:
khien tinh » thien tinh, khien thich, bien tinh
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
thang long » thanh cong
hoc khien » hoc hien, hoc nghien, hoc thieu
trinh cua » tinh cua, trinh luat, trinh quan
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 khien tinh - hanh trinh cua ((nhung cong) or (thang long)) tan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc khien tinh - hanh trinh cua ((nhung cong) OR (thang long)) tan ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc khien tinh - hanh trinh cua ((nhung cong) or (thang long)) tan ((toan cau) or (toan cao))*.