Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
thieu qua » thieu cua, thieu quang, thien quan
hanh mang » nhanh mang, hanh trang, nhanh lang
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
mang va » mang vua, hang va, bang va
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 ((hieu qua) or (thieu qua)) - hanh mang va thong cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu qua) OR (thieu qua)) - hanh mang va thong cong dan van ban*.