Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh chua » trinh chuan, trinh cua, trinh chu
cong ngang » cong nhan, cong quang, cong lang
hien tinh » khien tinh, thien tinh, bien tinh
chua dung » chua dong, thuat dung, chua nhung
cong vang » cong lang, cong quang, cong san
can ban » van ban, toan 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 hien tinh - hanh trinh chua dung ((cong vang) or (cong ngang)) ((can ban) or (nhat ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - hanh trinh chua dung ((cong vang) OR (cong ngang)) ((can ban) OR (nhat ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - hanh trinh chua dung ((cong vang) or (cong ngang)) ((can ban) or (nhat ban))*.