Perhaps you should try some spelling variations:
chuong duong » cuong duong, tuong duong, cuong dung
thuong dong » phuong dong, tuong dong, chuong dong
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
tieu tinh » trieu tinh, tieu trinh, lieu tinh
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu tinh - hanh trinh quan ((thuong dong) or (chuong duong)) hoc ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu tinh - hanh trinh quan ((thuong dong) OR (chuong duong)) hoc ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu tinh - hanh trinh quan ((thuong dong) or (chuong duong)) hoc ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: theo tieu tinh - hanh trinh quan ((thuong dong) or (chuong duong)) hoc ((toan cao) OR (toan tap))*.