Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
hieu sang » chieu sang, hieu lang, hieu quang
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - ((hanh tang) or (nhanh mang)) cua dung cong dan ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - ((hanh tang) OR (nhanh mang)) cua dung cong dan ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - ((hanh tang) or (nhanh mang)) cua dung cong dan ((toan tap) or (toan ban))*.