Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh di » thanh doi, thanh de, thanh do
tu sach » thu sach, su sach, te sach
dua ban » dia ban, cua ban, qua ban
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, de cua
ve cam » ve cham, ve cac, va cam
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: ((tu sach) or (thuat sach)) ky nang x hoi. hieu ve cam ((duc van) or (dua ban)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang x hoi. hieu ve cam ((duc van) OR (dua ban)) thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang x hoi. hieu ve cam ((duc van) or (dua ban)) thanh di cua tre*.