Perhaps you should try some spelling variations:
phuong tinh » phuong trinh, phuong binh, khuong tinh
dung phuong » dung thuong, bang phuong, dung chung
tang luan » dung luan
chi sang » chi lang, chieu sang, chi chang
mang cua » manh cua, dung cua, ban cua
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - hanh ((tang luan) or (mang cua)) dung phuong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - hanh ((tang luan) OR (mang cua)) dung phuong tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chi sang - hanh ((tang luan) or (mang cua)) dung phuong tinh toan cau*.