Perhaps you should try some spelling variations:
bang hang » ban hang, hang hang, nang hang
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
cham hoc » cham soc, chat hoc, cham hoi
hoc bang » hoc bong, hoc tang, hoc dan
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
hang ve » hang va, hanh ve, hang ke
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky nang mai khoi. hieu ve cham hoc bang hang ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang mai khoi. hieu ve cham hoc bang hang ve cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang mai khoi. hieu ve cham hoc bang hang ve cua tre*.