Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hang tai » hang va, dung tai
thuc va » thuc vat, thuc dan, thuc day
tai cua » thai cua, tai cuc, tri cua
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
tuc va » truc va, tuc xa, 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) or (hoc sach)) ky lang xa hoi. hieu va nam ((tuc va) or (thuc va)) hang tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky lang xa hoi. hieu va nam ((tuc va) OR (thuc va)) hang tai cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky lang xa hoi. hieu va nam ((tuc va) or (thuc va)) hang tai cua te*.