Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chieu sang » chieu sach, chieu xanh, hieu lang
cong tinh » cong trinh, cong vinh, long tinh
chu sang » chu bang, thu sang, chuc nang
tranh va » tranh van, trang va, trinh va
va trong » va truong, va thong, va tuong
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu sang) OR (chieu sang)) - hanh tranh va trong cong tinh toan ban~.
• Adding a wildcard symbol may retrieve word variants: theo ((chu sang) or (chieu sang)) - hanh tranh va trong cong tinh toan ban*.