Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
tan thanh » tran thanh, tang thanh, toan thanh
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
duoc tan » duc tan, duoc ban, duoc dan
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
cao hoc » co hoc, cho hoc, chat hoc
van lam » van nam
cua tre » cua te, cuu tre, cua triet

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 ky) OR (sach ty)) nang cao hoc. hieu van lam duoc tan thanh thai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) nang cao hoc. hieu van lam duoc tan thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) nang cao hoc. hieu van lam duoc tan thanh thai cua tre*.