Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
phuong tinh » phuong trinh, phuong binh, khuong tinh
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
hang cua » mang cua, hang ca, huong cua
manh cua » doanh cua, ban cua
toan cau » 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: doi hieu lang - hanh ((hang cua) or (manh cua)) dung phuong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((hang cua) OR (manh cua)) dung phuong tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh ((hang cua) or (manh cua)) dung phuong tinh toan cau*.