Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, chau tinh, kieu tinh
dinh trong » sinh trong, chinh trong, dinh thuong
lieu tinh » trieu tinh, diep tinh, bien tinh
tong cong » trong cong, dung cong, dang cong
cong cong » cong dong, trong cong, dung cong
trong va » trong van, trong ca, trong cac
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap

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

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