Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tren anh » tren lanh, tran anh, tien anh
duc tren » duoc tren, dua tren, duc tien
nang ma » tang ma, sang ma, nang cao
cua tre » cuu tre, cua triet, dua tren
anh vi » hanh vi, anh va, anh ve
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
ve cao » ve bao, ve cac, ve co
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 tren anh vi ((cua tre) or (cua te))~.
• 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 tren anh vi ((cua tre) OR (cua te)).
• 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 tren anh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ma hoi. hieu ((ve cao) OR (va cao)) duc tren anh vi ((cua tre) or (cua te))*.