Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
xanh hanh » danh thanh, ban hanh, dang hanh
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
van hanh » van thanh, ban hanh, van anh
toan ban » van ban
doi chi » doi khi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (toc thieu)) sach - ((xanh hanh) OR (van hanh)) va nhung cong manh toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chi) or (toc thieu)) sach - ((xanh hanh) OR (van hanh)) va nhung cong manh toan ban~".
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (toc thieu)) sach - ((xanh hanh) OR (van hanh)) va nhung cong manh toan ban*.