Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, cang thang, hung thang
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
hang ca » hang va, nang cao, hang tai
ca dung » cao dung, cap dung, cu dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((chieu sach) or (thi thanh))) or (hieu manh)) - hang hang ca dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((chieu sach) OR (thi thanh))) OR (hieu manh)) - hang hang ca dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((((chieu sach) or (thi thanh))) or (hieu manh)) - hang hang ca dung cong tac toan cau*.