Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh san » trinh han, trinh quan, trinh toan
thu canh » thuc hanh, thu cong, thu ban
hoc giao » hoc cao
thich su » tich su, thich ngu, thich sai
toan cao » toan ban, toan tap
du hanh » dieu hanh, duy khanh, luu hanh
lu hanh » luu hanh, ly hanh, tu hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu canh trinh san - hoc giao ) or ( ((du hanh) or (lu hanh)) thich su - toan cao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu canh trinh san - hoc giao ) OR ( ((du hanh) OR (lu hanh)) thich su - toan cao )).
• Adding a wildcard symbol may retrieve word variants: (( thu canh trinh san - hoc giao ) or ( ((du hanh) or (lu hanh)) thich su - toan cao ))*.