Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
trinh cua » tinh cua, trinh luat, trinh quan
hieu van » hieu va, thien van, lieu va
tong dan » tuong dan, thong dan, trong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
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: ho ((chieu sang) or (hieu van)) - hanh ((trinh cua) or (sinh va)) han tong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu van)) - hanh ((trinh cua) OR (sinh va)) han tong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu van)) - hanh ((trinh cua) or (sinh va)) han tong dan toan ban*.