Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cau phuc » cau truc, chau phu, huu phuc
phuc van » thuc van, phuc va, chuc van
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
hanh de » hanh ve, hanh kem
cua tre » cua triet, dua tren, cua thep
cuu tre » cau tren, cau treo
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 ky nang xa hoi. hieu van cau phuc van hanh de ((((cua tre) or (cuu tre))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu van cau phuc van hanh de ((((cua tre) OR (cuu tre))) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu van cau phuc van hanh de ((((cua tre) or (cuu tre))) or (cua te))*.