Perhaps you should try some spelling variations:
thieu hach » thien hach, hieu cach, thieu cac
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
tung cua » trung cua, tuong cua, dung cua
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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 hach) OR (chieu sach)) - thanh ((tung cua) or (dung cho)) thong cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu hach) OR (chieu sach)) - thanh ((tung cua) OR (dung cho)) thong cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) OR (chieu sach)) - thanh ((tung cua) or (dung cho)) thong cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hach) OR (chieu sach)) - thanh ((tung cua) or (dung cho)) thong cong san toan ban*.