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
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh quan
cua dong » chua dong, cua cong, cua dang
toan tap » toan 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 cua dong phuong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - hanh trinh cua dong phuong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu lang)) - hanh trinh cua dong phuong tinh toan tap*.