Perhaps you should try some spelling variations:
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
cac nhung » cac chung, cam nhung, cac phuong
cong toan » cong tan, cong hoan, cong tuan
nhanh cay » nhanh ha, nhanh va, hanh cac
nhanh bac » nhanh ha, nhanh va
cong cac » cuong cac, cong tac, cong cau

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

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