Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trien » hanh triet, hanh trinh, hanh thiet
trien viet » tieng viet
viet dung » viet hung, viet huong, viet trung
trong tac » trong cac, tuong tac, trong tan
nang quan » ban quan, nang suat
ho chieu » theo chieu, hoc thieu, mot chieu
hang ban » hang luan, hang va, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - hanh trien viet dung trong tac ((hang ban) or (nang quan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh trien viet dung trong tac ((hang ban) OR (nang quan))*.