Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
danh tai » doanh tai, dinh tai, hanh tai
doc sach » hoc sach, nuoc sach, dac sac
dang xay » dang van, van xay
va cham » va chat, va tham
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
va cam » va cac, va cao, va cai
cuc te » cua te, cuc thue, cuc tieu

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) or (doc sach)) ky dang xay hoi. hieu ((va cam) OR (va cham)) truc va danh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky dang xay hoi. hieu ((va cam) OR (va cham)) truc va danh tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) ky dang xay hoi. hieu ((va cam) OR (va cham)) truc va danh tai cuc te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ky dang xay hoi. hieu ((va cam) OR (va cham)) truc va danh tai cuc te*.