Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
doc sach » hoc sach, toc sach, nuoc sach
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de 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 (thu sach))) or (doc sach)) ky nang x hoi. hieu ve cam duc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sach) OR (thu sach))) OR (doc sach)) ky nang x hoi. hieu ve cam duc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((te sach) or (thu sach))) or (doc sach)) ky nang x hoi. hieu ve cam duc van hanh di cua tre*.