Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh van » doanh van, dang van, dinh van
nang ma » tang ma, sang ma, nang cao
van bac » van hac, dan bac, van bau
van bao » van dao
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: toc sach y nang ma hoi. hieu ((van bac) or (((van bao) OR (van ban)))) truc va danh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu ((van bac) OR (((van bao) OR (van ban)))) truc va danh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. hieu ((van bac) or (((van bao) OR (van ban)))) truc va danh van cua tre*".