Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
dinh nam » dinh lam, tinh nam, dinh van
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet

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) OR (thuoc sach)) ky nang xa hoi. hieu van pham duc va dinh nam cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu van pham duc va dinh nam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky nang xa hoi. hieu van pham duc va dinh nam cua tre*.