Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trang » canh tranh, hanh trinh, minh trang
thuc xanh » thuc hanh, thuc thanh, thuc dan
dung cong » dung trong
hoc thuc » hoc huu
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
san van » tan van, luan van, tran 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 trang) OR (thanh trung)) cua dung cong san van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuc xanh - ((hanh trang) OR (thanh trung)) cua dung cong san van ban".
• Adding a wildcard symbol may retrieve word variants: hoc thuc xanh - ((hanh trang) OR (thanh trung)) cua dung cong san van ban*.