Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thuc dan » hoc dan, thuc vat
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
anh ve » hanh ve, anh va, anh viet
ve cua » le cua, de cua, te cua
ve am » va am

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 am ((thuc dan) OR (thuc hanh)) anh ve 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 am ((thuc dan) OR (thuc hanh)) anh ve 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 am ((thuc dan) OR (thuc hanh)) anh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((xa hoi) or (ma hoa)). hieu ve am ((thuc dan) OR (thuc hanh)) anh ve cua tre*.