Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
doi chieu » doc hieu, doi chi, mot chieu
canh manh » lanh manh, canh tranh, cach mang
manh cua » doanh cua, ban cua
ban cong » bang cong, van cong, phan cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (doi chieu)) xanh - canh manh cua ban cong tac toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (doi chieu)) xanh - canh manh cua ban cong tac toan cao*.