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, hieu lang, nhieu tang
manh trung » manh tung, thanh trung, manh hung
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
toan cao » toan ban, toan tap

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