Perhaps you should try some spelling variations:
khung hoang » phuong hoang
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
hinh minh » hinh dinh, hinh kinh, trinh minh
hoang van » hang va
va khung » va nhung, va khong, va khang
toan cao » toan ban
toan tap » toan ban
minh va » tinh va, sinh va, sinh vat

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 sach) or (hieu lang)) - hinh minh va khung hoang van ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu lang)) - hinh minh va khung hoang van ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (hieu lang)) - hinh minh va khung hoang van ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu lang)) - hinh minh va khung hoang van ((toan cao) OR (toan tap))*.