Perhaps you should try some spelling variations:
thanh hoai » thanh hoa, thanh hai, thanh oai
thanh hoi » thanh hoa, thanh hai, thanh loi
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
cao hoi » cau hoi, co hoi, cao hoc
ty nang » ky nang, ty xang, ty hang
vu cam » vu cham, vu cao, tu cam
va cam » va cham, va cac, va cao
lo va » lo van, lao va, ly va

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 ty nang cao hoi. hieu ((vu cam) or (va cam)) lo va ((thanh hoi) OR (thanh hoai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang cao hoi. hieu ((vu cam) OR (va cam)) lo va ((thanh hoi) OR (thanh hoai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang cao hoi. hieu ((vu cam) or (va cam)) lo va ((thanh hoi) OR (thanh hoai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang cao hoi. hieu ((vu cam) or (va cam)) lo va ((thanh hoi) OR (thanh hoai)) cua tre*.