Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
hien tach » thien hach, vien bach, hien hanh
trinh cua » tinh cua, trinh luat, trinh quan
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
cua dung » cua dang, cua dong, qua dung
toan cau » toan cao, toan ban, toan tai
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: hoc ((hien tach) or (chiet tach)) - hanh trinh cua dung cong vang ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tach) OR (chiet tach)) - hanh trinh cua dung cong vang ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) or (chiet tach)) - hanh trinh cua dung cong vang ((toan cau) or (toan tap))*.