Perhaps you should try some spelling variations:
luong quang » luong quan, dung quang
dung luong » dung thuong, dung phuong, dung truong
quang toan » quang tuan, quang tran, quang doan
doi chieu » doc hieu, ho chieu, mot chieu
trung vat » trung va, trung van, truong van
trong vat » trong van, trong va, trong dat
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doi chi)) sach - thanh ((trung vat) OR (trong vat)) dung luong quang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - thanh ((trung vat) OR (trong vat)) dung luong quang toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) sach - thanh ((trung vat) OR (trong vat)) dung luong quang toan cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sach - thanh ((trung vat) OR (trong vat)) dung luong quang toan cao*.