Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
hang hoi » hang hoa, hang hai, hang doi
so sach » so sanh, bo sach, co sach
hoi cua » hoi chuc
va hang » van hang, va nang, va lang
chuc va » thuc va, thuc vat
ve pham » v pham, ve phan, ve phat
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me 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 (mai hoi)). hieu ((ve pham) OR (vi 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 (mai hoi)). hieu ((ve pham) OR (vi 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 (mai hoi)). hieu ((ve pham) OR (vi pham)) chuc va hang hoi cua te".
• Adding a wildcard symbol may retrieve word variants: so sach thi nang ((ma hoi) or (mai hoi)). hieu ((ve pham) OR (vi pham)) chuc va hang hoi cua te*.