Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
dien sach » dien anh
chon cac » cho cac, thong cac, hoc cac
tung va » trung va, tuong va, dung va
hoa cac » hoa chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((dien sach) or (chieu sach)) - thanh tung va nhung cong thanh ((hoa cac) OR (chon cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((dien sach) OR (chieu sach)) - thanh tung va nhung cong thanh ((hoa cac) OR (chon cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((dien sach) or (chieu sach)) - thanh tung va nhung cong thanh ((hoa cac) OR (chon cac))".
• Adding a wildcard symbol may retrieve word variants: theo ((dien sach) or (chieu sach)) - thanh tung va nhung cong thanh ((hoa cac) OR (chon cac))*.