Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tran hoang » tran hong, quan hoang, tran quang
cong manh » cong danh, duong manh, cong thanh
hoc dieu » hoc thieu, hoc hien
van hoan » van hoang, van hoa, van toan
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dieu hanh - hanh trinh ((tran hoang) or (van hoan)) cong manh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu hanh - hanh trinh ((tran hoang) OR (van hoan)) cong manh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - hanh trinh ((tran hoang) or (van hoan)) cong manh ((toan cao) or (toan ban))*.