Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van nang » van quang, van ban, van dong
cham loc » cham soc, chon loc, hau loc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
v nang » va nang, vu nang, voi nang
cham o » cham soc
va dao » ca dao
dao di » dao do, dao du, dao li
di cuu » di cau, di cua, dinh cuu

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 ((v nang) or (van nang)) xa hoi. hieu ve ((cham loc) or (cham o)) va dao di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (van nang)) xa hoi. hieu ve ((cham loc) OR (cham o)) va dao di cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (van nang)) xa hoi. hieu ve ((cham loc) or (cham o)) va dao di cuu tre*.