Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va hanh » van hanh, va thanh, va danh
hau loc » huu loc, phau hoc
cau loc » cau hoc, cau luc, cau long
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach v nang ((x hoi) OR (xa hoi)). hieu ve ((cau loc) or (hau loc)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach v nang ((x hoi) OR (xa hoi)). hieu ve ((cau loc) OR (hau loc)) va hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach v nang ((x hoi) OR (xa hoi)). hieu ve ((cau loc) or (hau loc)) va hanh vi cua tre*".