Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu ve » hieu va, hieu van
hang de » hoang de, hanh de, hang di
va hang » van hang, va nang, va lang
cam tuc » cam xuc, cam tu, nam thuc
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((te sach) OR (toc sach))) or (bo sach)) ky nang x hoi. hieu ve cam tuc va hang de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sach) OR (toc sach))) OR (bo sach)) ky nang x hoi. hieu ve cam tuc va hang de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((te sach) OR (toc sach))) or (bo sach)) ky nang x hoi. hieu ve cam tuc va hang de cua tre*".