Perhaps you should try some spelling variations:
phuong trinh » chuong trinh, cong trinh, huong tran
trinh toan » tinh toan, thanh toan, trinh han
hieu sang » chieu sang, hieu lang, hieu quang
hoang cua » hang cua, hoang xuan, hoang tuan
doc hieu » toc thieu, hoc thieu, hoc hien
hoan cua » hoa cua, toan cua, han cua
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: doc hieu sang - anh ((hoang cua) or (hoan cua)) bang phuong trinh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - anh ((hoang cua) OR (hoan cua)) bang phuong trinh toan cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - anh ((hoang cua) or (hoan cua)) bang phuong trinh toan cao*.