Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
duoc ban » duc ban, quoc ban, buoc ban
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
da duoc » tao duoc, hoa duoc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
va da » va dao, va dau, va dap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (su sach)) ky tang xa hoi. hieu va da duoc ban ((hanh di) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (su sach)) ky tang xa hoi. hieu va da duoc ban ((hanh di) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (su sach)) ky tang xa hoi. hieu va da duoc ban ((hanh di) or (hanh de)) cua tre*.