Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong van » phung van, phong van, phuong lan
hieu lang » chieu sang, hieu quang, nhieu tang
ctinh cua » chinh cua, sinh cua, trinh cua
doi hieu » doi chieu, doc hieu, doi hien
tinh cua » trinh cua, sinh cua, tinh chat
van toan » van tuan, van tan, van thanh
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 ((ctinh cua) or (tinh cua)) nhung phuong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - hanh ((ctinh cua) OR (tinh cua)) nhung phuong van toan cau*.