Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh hoi » hanh thoi, hanh noi, hanh hoa
van hanh » van thanh, ban hanh, van anh
hoi cua » hoi chuc
duc van » duc va, duc tan, duc manh
ve pham » vi pham, ve phan, ve phat
mai hoi » mai khoi, dai hoi, lai hoi
sach v » sach va, sach y, sach 2
v pham » vi pham, d pham
ma hoi » xa hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang
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: toc sach v nang ((ma hoi) or (mai hoi)). hieu ((ve pham) or (v pham)) duc van hanh hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang ((ma hoi) OR (mai hoi)). hieu ((ve pham) OR (v pham)) duc van hanh hoi cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach v nang ((ma hoi) or (mai hoi)). hieu ((ve pham) or (v pham)) duc van hanh hoi cua te*.