Perhaps you should try some spelling variations:
phuong khanh » phuong thanh, phuong hanh, phuong anh
nhung phuong » dung phuong, nhu phuong, truong phuong
chieu sang » chieu sach, chieu xanh, nhieu tang
khanh toan » thanh toan, khanh thanh, khanh thuan
hieu lang » hieu quang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
tung cua » tuong cua, dung cua, tang 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: hoc ((chieu sang) or (hieu lang)) - manh ((tung cua) OR (trung cua)) nhung phuong khanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - manh ((tung cua) OR (trung cua)) nhung phuong khanh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - manh ((tung cua) OR (trung cua)) nhung phuong khanh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - manh ((tung cua) OR (trung cua)) nhung phuong khanh toan cau*.