Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
chat duc » chat xuc, chat doc, chet duoc
hieu vu » hieu va, hieu ve, hieu su
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
vu chat » va chat, ve chat, du chat
te sach » toc sach
ky tang » ky dang, kho tang, ky trong
cua tre » cua te, cuu tre, cua triet
ho hoi » hoc hoi, hoa hoi, hoi hoi
di cua » dai cua, doi cua, de cua

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)) ((ky tang) or (ky nang)) ho hoi. hieu vu chat duc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ((ky tang) OR (ky nang)) ho hoi. hieu vu chat duc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ((ky tang) or (ky nang)) ho hoi. hieu vu chat duc van hanh di cua tre*.