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 dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
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 dong)) cong tang van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuc xanh - hanh trinh ((cua dung) OR (cua dong)) cong tang van ban".
• Adding a wildcard symbol may retrieve word variants: hoc thuc xanh - hanh trinh ((cua dung) OR (cua dong)) cong tang van ban*.