Perhaps you should try some spelling variations:
quan hanh » quan thanh, quang thanh, quang khanh
hoc quan » hoc dan, tac quan, hoc phan
cham hoc » cham soc, chat hoc, cham hoi
bo sach » co sach, hoc sach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
mang xa » mang may, dang xay, mang cua
cua tre » cua te, cuu tre, cua triet
ang xa » dang xay, hoang xa, trang xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky ((((ang xa) or (mang xa))) or (lang xa)) hoi. hieu vu cham hoc quan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky ((((ang xa) OR (mang xa))) OR (lang xa)) hoi. hieu vu cham hoc quan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((((ang xa) or (mang xa))) or (lang xa)) hoi. hieu vu cham hoc quan hanh vi cua tre*.