Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
hang tai » hang va, dung tai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
cua tu » cua tuc, cua cu, cua vu
cua su » qua su

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 cac thuc va hang tai ((cua te) or (((cua tu) or (cua su))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu va cac thuc va hang tai ((cua te) OR (((cua tu) OR (cua su)))).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu va cac thuc va hang tai ((cua te) or (((cua tu) or (cua su))))*.