Perhaps you should try some spelling variations:
thien chien » thien nhien
hieu vien » hieu hien, hieu viec, thieu nien
ban hanh » ban hang
sach ly » sach y, sach lo, sach ty
va hanh » van hanh, va thanh, va danh
cac thu » cach thuc, cac thoi
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang o hoc. ((hieu vien) or (thien chien)) cac thu ((va hanh) or (ban hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang o hoc. ((hieu vien) OR (thien chien)) cac thu ((va hanh) OR (ban hanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang o hoc. ((hieu vien) or (thien chien)) cac thu ((va hanh) or (ban hanh)) vi cua tre*.