Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh han » trinh quan
thong dan » thong van, thong den, trong dan
tuong dan » huong dan, tung dan, xuong dan
ho chiet » ho thiet, hoc thiet, hoa thiet
ho chieu » theo chieu, hoc thieu, doi chieu
toan tap » toan ban
han sau » nhan sau, han dau, han san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chiet) or (ho chieu)) tach - hanh trinh han sau ((thong dan) OR (tuong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (ho chieu)) tach - hanh trinh han sau ((thong dan) OR (tuong dan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chiet) or (ho chieu)) tach - hanh trinh han sau ((thong dan) OR (tuong dan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) or (ho chieu)) tach - hanh trinh han sau ((thong dan) OR (tuong dan)) toan tap*.