Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
hoa chinh » hoan chinh, hoa hinh, hoa thinh
thang va » hang va, trang va, thong va
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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) or (hoa chinh)) sach - cang thang va ((nhung cong) OR (thong cong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chinh) OR (hoa chinh)) sach - cang thang va ((nhung cong) OR (thong cong)) dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chinh) or (hoa chinh)) sach - cang thang va ((nhung cong) OR (thong cong)) dan than cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc chinh) or (hoa chinh)) sach - cang thang va ((nhung cong) OR (thong cong)) dan than cao*.