Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cac xuc » cam xuc, cac nuoc, chat xuc
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
xuc van » duc van, luc van, vuc van
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
o lang » hoa lang, hoi lang

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