Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh loi
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » tu sach, thuat sach, thuoc sach
duc ban » duc tan, duc van, dua ban
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang o hoi. hieu ((ve cac) or (ve cham)) duc ban ((thanh hoi) OR (thanh hai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang o hoi. hieu ((ve cac) OR (ve cham)) duc ban ((thanh hoi) OR (thanh hai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang o hoi. hieu ((ve cac) or (ve cham)) duc ban ((thanh hoi) OR (thanh hai)) cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang o hoi. hieu ((ve cac) or (ve cham)) duc ban ((thanh hoi) OR (thanh hai)) cua te*.