Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang van » dang van, tang van, lang van
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
hanh de » hanh kem
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang van hoi. hieu va pham duc va ((hanh de) OR (hanh ve)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang van hoi. hieu va pham duc va ((hanh de) OR (hanh ve)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang van hoi. hieu va pham duc va ((hanh de) OR (hanh ve)) cua tre*.