Perhaps you should try some spelling variations:
bang hang » ban hang, hang hang, nang hang
nang dai » nang dau, nang tai, lang dai
cham hoc » chat hoc, cham hoi, cho hoc
te sach » toc sach
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
hang ve » hang va, hanh ve, hang ke
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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 y nang dai hoi. hieu ve ((cham hoc) or (cham soc)) bang hang ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang dai hoi. hieu ve ((cham hoc) OR (cham soc)) bang hang ve cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang dai hoi. hieu ve ((cham hoc) or (cham soc)) bang hang ve cua tre*.