Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, te sach, tu cach
hieu ve » hieu va, hieu van
hieu vu » hieu va, hieu su, dieu vu
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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 hoi. ((hieu vu) or (hieu ve)) cam lo van thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang ma hoi. ((hieu vu) OR (hieu ve)) cam lo van thanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang ma hoi. ((hieu vu) or (hieu ve)) cam lo van thanh thai cua tre*.