Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh trinh » canh tranh, hanh chinh
dung huong » dung thuong, dung phuong, dong huong
hien xanh » hien hanh, chieu xanh, hien khanh
trinh sat » trinh san, trinh sau, trinh sai
sat dung » suat dung, vat dung, dat dung
toan cau » toan cao, toan tap, toan tai
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: hoc ((hien xanh) or (hien nhanh)) - hanh trinh sat dung huong dan ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh trinh sat dung huong dan ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - hanh trinh sat dung huong dan ((toan cau) or (toan ban))*.