Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
cau phuc » cau truc, chau phu, huu phuc
doc sach » hoc sach, nuoc sach, dac sac
van hanh » van thanh, ban hanh, van anh
phuc van » thuc van, phuc va, chuc van
hieu van » hieu va, thien van, lieu va
cua tre » cuu tre, cua triet, dua tren
hanh de » hanh ve, hanh kem
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
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) OR (doc sach)) ty nang xa hoi. hieu van cau phuc van hanh de ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty nang xa hoi. hieu van cau phuc van hanh de ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ty nang xa hoi. hieu van cau phuc van hanh de ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ty nang xa hoi. hieu van cau phuc van hanh de ((cua tre) or (cua te))*.