Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thuc xanh » thuc hanh, thuc thanh, thuc dan
cong tang » cong thang, cong tan, cong lang
hoc thuc » hoc huu
cua dung » cua dong, qua dung, cua rung
cua dang » cua cong, cua ban
tang van » dang van, hoang van, trong van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuc xanh - hanh trinh ((cua dung) or (cua dang)) cong tang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuc xanh - hanh trinh ((cua dung) OR (cua dang)) cong tang van ban.
• Adding a wildcard symbol may retrieve word variants: hoc thuc xanh - hanh trinh ((cua dung) or (cua dang)) cong tang van ban*.