Perhaps you should try some spelling variations:
chinh trong » chinh cong
chieu sang » chieu sach, hieu lang, nhieu tang
chieu xanh » chieu sach, chieu tinh, hieu manh
hinh trong » dinh trong, sinh trong, binh trong
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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: hoc ((chieu sang) OR (chieu xanh)) - ((chinh trong) or (hinh trong)) quan dung cong bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu xanh)) - ((chinh trong) OR (hinh trong)) quan dung cong bai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) OR (chieu xanh)) - ((chinh trong) or (hinh trong)) quan dung cong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) OR (chieu xanh)) - ((chinh trong) or (hinh trong)) quan dung cong bai toan cao*.