Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
hang hoi » hang hoa, hang hai, hang doi
hoi cua » hoi chuc
va hang » van hang, va nang, va lang
chuc va » thuc va, thuc vat
ve pham » vi pham, v pham, ve phan
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » ma hoa, me hoi, va hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thi nang ((((ma hoi) OR (xa hoi))) or (mai hoi)). hieu ve pham chuc va hang hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thi nang ((((ma hoi) OR (xa hoi))) OR (mai hoi)). hieu ve pham chuc va hang hoi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thi nang ((((ma hoi) OR (xa hoi))) or (mai hoi)). hieu ve pham chuc va hang hoi cua te".
• Adding a wildcard symbol may retrieve word variants: so sach thi nang ((((ma hoi) OR (xa hoi))) or (mai hoi)). hieu ve pham chuc va hang hoi cua te*.