Perhaps you should try some spelling variations:
phuong dong » phuong dung, phuong hoang, chuong duong
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
hanh hang » thanh hang, hang hang, hanh han
va phuong » va thuong, cac phuong
dong tac » cong tac, dong tai, dong bac
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sang - hanh hang va phuong dong tac ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sang - hanh hang va phuong dong tac ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - hanh hang va phuong dong tac ((toan tap) OR (toan ban))*.