Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
danh di » danh du, xanh di, danh dien
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, duc va
di cuu » di cau, di cua, dinh cuu

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 (hoc sach)) ky nang xa hoi. lieu va cham ((tuc va) or (tuc xa)) danh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky nang xa hoi. lieu va cham ((tuc va) OR (tuc xa)) danh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky nang xa hoi. lieu va cham ((tuc va) or (tuc xa)) danh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky nang xa hoi. lieu va cham ((tuc va) or (tuc xa)) danh di cuu tre*.