Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
hoc vat » hoc va, hoc viet, thuc vat
cua tre » cuu tre, cua triet, dua tren
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
vu kham » vu khanh
cua te » cua tu
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh

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 ty ang xa hoi. hieu ((va cham) or (vu kham)) hoc vat hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ang xa hoi. hieu ((va cham) OR (vu kham)) hoc vat hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ang xa hoi. hieu ((va cham) or (vu kham)) hoc vat hanh vi ((cua tre) or (cua te))*.