Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
cac xuc » cam xuc, cac nuoc, chat xuc
xang xa » lang xa, mang xa, ang xa
va dan » ca dan, va dao, va dau
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: su sach ty xang xa hoi. hieu van ((cac xuc) or (dat nuoc)) ((van hanh) or (va dan)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang xa hoi. hieu van ((cac xuc) OR (dat nuoc)) ((van hanh) OR (va dan)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. hieu van ((cac xuc) or (dat nuoc)) ((van hanh) or (va dan)) vi cua tre*.