Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
chat duc » chat xuc, chat doc, chet duoc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
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: ((su sach) or (((toc sach) or (thuoc sach)))) ky nang x hoi. hieu ve chat duc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((toc sach) OR (thuoc sach)))) ky nang x hoi. hieu ve chat duc van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((toc sach) or (thuoc sach)))) ky nang x hoi. hieu ve chat duc van hanh vi cuu tre*.