Perhaps you should try some spelling variations:
phuong tinh » phuong trinh, phuong binh, khuong tinh
dong phuong » duong phuong, dung phuong, dong huong
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
quan dong » quang dong, quan long, quan hoang
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: doc ((hieu sang) or (hieu lang)) - hanh trinh quan dong phuong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - hanh trinh quan dong phuong tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu lang)) - hanh trinh quan dong phuong tinh toan ban*.