Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
dien sach » dien anh
cua thong » cua thuong, cua khong, cua tong
thong dan » thong van, tuong dan, thong den
doc dien » duoc dien, doi dien, do dien
van manh » van minh, van anh, van hanh
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc dien sach - ((hanh trinh) or (van manh)) cua thong thong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc dien sach - ((hanh trinh) OR (van manh)) cua thong thong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: doc dien sach - ((hanh trinh) or (van manh)) cua thong thong dan toan cao*.