Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
nang dai » nang dau, nang tai, lang dai
hai cuc » tai cuc, hai cua, thai cua
dua ban » dia ban, qua ban, mua ban
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ty nang » ky nang, ty xang, ty hang
cuc tre » duc tre, cua tre, cuu tre
ve cam » ve cham, ve cac, va cam

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) OR (doc sach)) ty nang dai hoi. hieu ve cam ((dua ban) or (cua ban)) thanh hai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty nang dai hoi. hieu ve cam ((dua ban) OR (cua ban)) thanh hai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ty nang dai hoi. hieu ve cam ((dua ban) or (cua ban)) thanh hai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ty nang dai hoi. hieu ve cam ((dua ban) or (cua ban)) thanh hai cuc tre*.