Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
nang cong » nang song, dang cong, bang cong
cong manh » cong danh, duong manh, cong thanh
chinh va » chinh ta, chinh tai, hanh va
toan cao » toan tap
toan ban » van ban
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - hanh chinh va nang cong manh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh chinh va nang cong manh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh chinh va nang cong manh ((toan cao) or (toan ban))*.