Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cua triet, dua tren
nang di » nang du, hang di, nang ji
va nang » van nang, da nang, cam nang
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
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 ((nang xa) or (tang ma)) hoi. hieu va cham luc va nang di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu ((nang xa) OR (tang ma)) hoi. hieu va cham luc va nang di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach tu ((nang xa) or (tang ma)) hoi. hieu va cham luc va nang di ((cua tre) or (cuu tre))*.