Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh sai » trinh tai, trinh san, trinh dai
toan giao » ton giao, toan cao, hoa giao
hoc giao » hoc cao
tu manh » tu minh, tu hanh, vu manh
tich su » lich su, tich du, tinh su
tich so » tich bao, tinh son
lu hanh » luu hanh, du hanh, ly hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu manh ((tich su) OR (tich so)) - hoc giao ) or ( lu hanh trinh sai - toan giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu manh ((tich su) OR (tich so)) - hoc giao ) OR ( lu hanh trinh sai - toan giao ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu manh ((tich su) OR (tich so)) - hoc giao ) or ( lu hanh trinh sai - toan giao ))*".