Perhaps you should try some spelling variations:
thong trong » thuong trong, thong thong, thong thuong
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh sinh » hanh tinh, hanh dinh, hinh sinh
trong van » trong cac
va thong » va thuong, va phuong, he thong
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
sinh va » sinh vat, tinh va, dinh van

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 xanh) or (chieu sach)) - hanh sinh va thong trong van ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sach)) - hanh sinh va thong trong van ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sach)) - hanh sinh va thong trong van ((toan cau) or (toan cao))*.