Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
tu sach » thu sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu su, dieu vu
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) y nang ma hoa. ((hieu vu) or (hieu ve)) cam lo van thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang ma hoa. ((hieu vu) OR (hieu ve)) cam lo van thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang ma hoa. ((hieu vu) or (hieu ve)) cam lo van thanh tai cua tre*.