Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
manh tinh » man tinh, manh binh, canh tinh
nang cong » nang song, dang cong, bang cong
cong manh » cong danh, duong manh, cong thanh
tinh van » trinh van, dinh van, tinh va
van nang » van quang, van ban, van dong
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: ho ((hieu lang) or (chieu sach)) - manh tinh van nang cong manh ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (chieu sach)) - manh tinh van nang cong manh ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (chieu sach)) - manh tinh van nang cong manh ((toan tap) or (toan ban))*.