Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu ve » hieu va, hieu van
suc tan » duc tan, tuc tang, duc toan
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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 y nang ((xa hoi) or (ma hoa)). hieu ve cao ((suc tan) OR (suc manh)) anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ((xa hoi) OR (ma hoa)). hieu ve cao ((suc tan) OR (suc manh)) anh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ((xa hoi) or (ma hoa)). hieu ve cao ((suc tan) OR (suc manh)) anh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((xa hoi) or (ma hoa)). hieu ve cao ((suc tan) OR (suc manh)) anh vi cua tre*.