Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
nang cong » dang cong, bang cong, hang cong
ho chieu » hoc thieu, doi chieu, mot chieu
tac toan » tap toan, tam toan, hach toan
toan ban » van ban
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (theo chieu)) xanh - nhanh tinh va ((nang cong) OR (nang song)) tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) xanh - nhanh tinh va ((nang cong) OR (nang song)) tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) xanh - nhanh tinh va ((nang cong) OR (nang song)) tac toan ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) xanh - nhanh tinh va ((nang cong) OR (nang song)) tac toan ban*.