Perhaps you should try some spelling variations:
thien van » thi van
sach tham » sach nha
tham ang » tham lang, nham nang, pham hang
hieu van » hieu va, lieu va, hieu ve
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
ang xa » lang xa, mang xa, dang xay

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tham ang xa hoi. ((hieu van) OR (thien van)) cac ((xuc va) OR (truc va)) hanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tham ang xa hoi. ((hieu van) OR (thien van)) cac ((xuc va) or (truc va)) hanh hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach tham ang xa hoi. ((hieu van) OR (thien van)) cac ((xuc va) or (truc va)) hanh hai cua tre*.