Perhaps you should try some spelling variations:
cong nguong » cong nguon, cong thuong, cong luong
nguong dan » huong dan
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
ho chieu » theo chieu, doi chieu, mot chieu
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - ((hanh tang) OR (hanh mang)) cua cong nguong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - ((hanh tang) OR (hanh mang)) cua cong nguong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - ((hanh tang) OR (hanh mang)) cua cong nguong dan van ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - ((hanh tang) OR (hanh mang)) cua cong nguong dan van ban*.