Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
minh ai » minh hai, minh lai, minh tai
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ve cao » ve bao, ve cac, ve co
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa

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