Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
chung cong » nhung cong, chong cong, phung cong
hoc thieu » toc thieu, hoc hien
danh tinh » doanh tinh, dang tinh, canh tinh
cong cong » cong dong, trong cong, dung cong
phan cac » nhan cach, phan lap, phan van
phan dau » phan tu, hang dau

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

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