Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thien hach » thien thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
luan chung » luan chinh
huong van » huong dan, duong van, luong van
hong van » hoang van, thong van, phong van
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 ((chieu sach) or (thien hach)) - hanh trinh luan chung ((huong van) or (hong van)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (thien hach)) - hanh trinh luan chung ((huong van) OR (hong van)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien hach)) - hanh trinh luan chung ((huong van) or (hong van)) toan tap*.