Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan nhung » qua nhung, cua nhung, luan chung
nhung cong » dung cong, thong cong, hang cong
tien manh » tien anh, tien thanh, tieng anh
cong van » cong vang, cong san, song van
tan tap » toan tap, tan tat, man tap
han tap » han tai, toan tap, nhan tai

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 quan nhung cong van ((tan tap) OR (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (thien thanh)) - hanh trinh quan nhung cong van ((tan tap) OR (han tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien manh) or (thien thanh)) - hanh trinh quan nhung cong van ((tan tap) OR (han tap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) or (thien thanh)) - hanh trinh quan nhung cong van ((tan tap) OR (han tap))*.