Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
manh huong » anh huong, manh hung, manh cuong
thong cong » trong cong, tong cong, thong thong
huong cua » dung cua
cua thong » cua thuong, cua khong, cua tong
cong tan » cong tac, cong san, cong thanh
nhan tap » nhan tai, nhan tao, phan tap
han tap » han tai, toan tap, nhan tai

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 sach) or (nhieu tang)) - manh huong cua thong cong tan ((nhan tap) OR (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (nhieu tang)) - manh huong cua thong cong tan ((nhan tap) OR (han tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (nhieu tang)) - manh huong cua thong cong tan ((nhan tap) OR (han tap))".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (nhieu tang)) - manh huong cua thong cong tan ((nhan tap) OR (han tap))*.