Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
qua pham » quan pham, quy pham, qua cham
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
cua te » cua tu

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