Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
de cua » le cua, te cua, dieu 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) OR (doc sach)) vu nang xa hoi. hieu va ((cam luc) or (chau au)) va hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) vu nang xa hoi. hieu va ((cam luc) OR (chau au)) va hanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) vu nang xa hoi. hieu va ((cam luc) or (chau au)) va hanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) vu nang xa hoi. hieu va ((cam luc) or (chau au)) va hanh de cua tre*.