Perhaps you should try some spelling variations:
phuong tinh » phuong trinh, phuong binh, khuong tinh
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
manh hung » anh huong
hung cua » huong cua, chung cua, khung cua
cua bang » chua bang, cua ban, cua dang
toan ban » van ban

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) OR (((chieu sang) OR (hieu lang)))) - manh hung cua bang phuong tinh toan ban~".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) OR (((chieu sang) OR (hieu lang)))) - manh hung cua bang phuong tinh toan ban*.