Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
ban thanh » ban hanh, ban hang
thai cua » than cua, tai cuc, tri cua
su sach » vu sach
hieu va » lieu va, hieu qua
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
cao hoc » co hoc, cho hoc, chat hoc
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ty nang cao hoc. ((hieu ve) or (hieu va)) cam dua ban thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang cao hoc. ((hieu ve) OR (hieu va)) cam dua ban thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang cao hoc. ((hieu ve) or (hieu va)) cam dua ban thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty nang cao hoc. ((hieu ve) or (hieu va)) cam dua ban thanh thai cua tre*.