Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
luan nhan » luan phan, luan nha, xuan nhan
ho chieu » theo chieu, hoc thieu, doi chieu
tung dan » dung dan, trung dai, dung dat
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chi)) sach - hanh trinh luan nhan ((huong dan) or (tung dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) sach - hanh trinh luan nhan ((huong dan) OR (tung dan)) toan cao.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) sach - hanh trinh luan nhan ((huong dan) or (tung dan)) toan cao*.