Perhaps you should try some spelling variations:
phuong dong » phuong dung, phuong hoang, chuong duong
chieu sang » chieu sach, chieu xanh, hieu lang
dong ngang » cong ngang, dong nang, dong ngan
ngang toan » nganh toan, dang toan, quang toan
doi chieu » doc hieu, doi chi, ho chieu
toan cau » toan cao, toan ban, toan tap
hanh va » hang va, hanh vi
han va » hang va, nhan va, ban va

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - hanh ((han va) OR (hanh va)) phuong dong ngang toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh ((han va) OR (hanh va)) phuong dong ngang toan cau*.