Perhaps you should try some spelling variations:
va tuong » va thuong, va thong, xa truong
va huong » va thuong, va phuong, ban huong
so sach » so sanh, bo sach, co sach
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
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: so sach ty nang ma hoi. hieu ((ve cam) or (va cam)) tuc ((va huong) OR (va tuong)) hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang ma hoi. hieu ((ve cam) OR (va cam)) tuc ((va huong) OR (va tuong)) hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ma hoi. hieu ((ve cam) or (va cam)) tuc ((va huong) OR (va tuong)) hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ma hoi. hieu ((ve cam) or (va cam)) tuc ((va huong) OR (va tuong)) hoi cua tre*.