Perhaps you should try some spelling variations:
theo lieu » theo tieu, theo chieu, theo yeu
lieu tinh » trieu tinh, diep tinh, bien tinh
anh sang » lanh sang, anh bang, anh dang
anh dung » anh dong, anh huong, sach dung
va trong » va truong, va thong, va tuong
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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

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