Perhaps you should try some spelling variations:
thien chanh » thien chinh, hien hanh, tien thanh
thien thanh » tien thanh, thi thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
trong van » trong cac
trinh ve » trinh he, trinh va, trinh vi
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
ve dung » ve duong, ve rung, va dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien chanh) or (thien thanh)) - hanh trinh ve dung trong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien chanh) OR (thien thanh)) - hanh trinh ve dung trong van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien chanh) or (thien thanh)) - hanh trinh ve dung trong van toan cao*.