Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
trong dong » trong cong, trong nong, trong dang
trinh qua » trinh quan, trinh cua, trinh quang
dong than » dong thanh, dong thuan, dong chan
qua dung » quang dung, su dung, qua song
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (trieu tinh)) - hanh trinh qua dung trong dong than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (trieu tinh)) - hanh trinh qua dung trong dong than tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (trieu tinh)) - hanh trinh qua dung trong dong than tap*.