Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
ban hanh » ban hang
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
cac luc » cau luc, coc luc, cac nuoc
luc ban » duc ban, cuc ban, luc bat
cua tre » cua te, cuu tre, cua triet
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: thu ((sach ky) OR (sach ty)) nang xa hoi. ((hieu van) or (lieu va)) cac luc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang xa hoi. ((hieu van) OR (lieu va)) cac luc ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang xa hoi. ((hieu van) or (lieu va)) cac luc ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang xa hoi. ((hieu van) or (lieu va)) cac luc ban hanh vi cua tre*.