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
doi cua » dai cua, hoi cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di cua » dai cua, de cua, do cua

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