Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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 tu lang xa hoi. hieu vu cham luc va ((kinh te) or (dich te)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu lang xa hoi. hieu vu cham luc va ((kinh te) OR (dich te)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tu lang xa hoi. hieu vu cham luc va ((kinh te) or (dich te)) cua tre*.