Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thuyet anh » thuyet kinh, thuy anh, thuyet dan
thiet anh » thien anh, thien danh, thich anh
luat hang » luat hanh, luat chung, luat quang
nong tap » tong tap, nong tan, nhung tap
cong tac » cong ty
quan cao » quang cao, quan cau, quan ao

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 anh) OR (thuyet anh)) - hanh trinh luat hang ((nong tap) or (cong tac)) quan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet anh) OR (thuyet anh)) - hanh trinh luat hang ((nong tap) OR (cong tac)) quan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet anh) OR (thuyet anh)) - hanh trinh luat hang ((nong tap) or (cong tac)) quan cao*".