Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau phuc » cau truc, chau phu, huu phuc
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach 2 » sach y
2 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 2 nang xa hoi. hieu va ((cam luc) or (cau phuc)) va hanh ((le cua) OR (ly cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach 2 nang xa hoi. hieu va ((cam luc) OR (cau phuc)) va hanh ((le cua) OR (ly cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach 2 nang xa hoi. hieu va ((cam luc) or (cau phuc)) va hanh ((le cua) OR (ly cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach 2 nang xa hoi. hieu va ((cam luc) or (cau phuc)) va hanh ((le cua) OR (ly cua)) tre*.