Perhaps you should try some spelling variations:
phuong tinh » phuong trinh, phuong binh, khuong tinh
manh trung » thanh trung, manh hung, sinh trung
thieu sach » chieu sach, thien hach, theo sach
hieu cach » hieu cac, chieu sach, hieu ca
manh tung » manh hung, thanh tung
cua bang » chua bang, cua ban, cua dang
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: hoc ((thieu sach) or (hieu cach)) - ((manh trung) OR (manh tung)) cua bang phuong tinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - ((manh trung) OR (manh tung)) cua bang phuong tinh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (hieu cach)) - ((manh trung) OR (manh tung)) cua bang phuong tinh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu cach)) - ((manh trung) OR (manh tung)) cua bang phuong tinh toan cao*.