Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
luan chung » luan chinh
chung cong » nhung cong, chong cong, phung cong
tien manh » tien anh, tien thanh, tieng anh
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien manh) or (thien thanh)) - hanh trinh luan chung cong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (thien thanh)) - hanh trinh luan chung cong van tan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) or (thien thanh)) - hanh trinh luan chung cong van tan tap*.