Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
gian nan » gian dan, gian lan, gian 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 chinh sach - ((hanh tang) or (hanh mang)) cua ((nhung cong) OR (thong cong)) dan gian nan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - ((hanh tang) OR (hanh mang)) cua ((nhung cong) OR (thong cong)) dan gian nan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chinh sach - ((hanh tang) or (hanh mang)) cua ((nhung cong) OR (thong cong)) dan gian nan".
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - ((hanh tang) or (hanh mang)) cua ((nhung cong) OR (thong cong)) dan gian nan*.