Perhaps you should try some spelling variations:
phuong tinh » phuong trinh, phuong binh, khuong tinh
dung phuong » dung thuong, bang phuong, dung chung
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
manh trung » manh tung, thanh trung, manh hung
trung cua » truong cua, trung tuan, trung cap
cua dung » cua dang, cua dong, qua dung
toan cao » toan ban
toan tap » toan ban

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

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