Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cai
tuc va » thuc va, truc va, duc va
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ma hoi. hieu ((va cam) OR (va cao)) ((tuc va) or (tuc xa)) danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu ((va cam) OR (va cao)) ((tuc va) OR (tuc xa)) danh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. hieu ((va cam) OR (va cao)) ((tuc va) or (tuc xa)) danh vai cua tre*".