Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
tuc va » thuc va, truc va, duc va
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 va chat ((tuc va) OR (tuc xa)) hanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. hieu va chat ((tuc va) OR (tuc xa)) hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va chat ((tuc va) OR (tuc xa)) hanh dai cua te*.