Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
luoc can » luc canh, hoc can, luoc dai
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
cho hoc » co hoc, khoa hoc
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
anh vi » hanh vi, anh va, anh ve
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: te sach y nang ((cao hoi) or (cho hoc)). hieu van nam ((luc van) or (luoc can)) anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((cao hoi) OR (cho hoc)). hieu van nam ((luc van) OR (luoc can)) anh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((cao hoi) or (cho hoc)). hieu van nam ((luc van) or (luoc can)) anh vi cua tre*.