Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
thuc van » thuc vat, thuc dan, thuc va
ve cham » va cham, ve chat, vu cham
duc van » duc va, duc tan, duc manh
cua duc » cua tuc, cua nuoc, cua quoc
xay hoi » xa hoi, tay hoi, cay phoi
y dang » ky dang, 2 dang, _ dang
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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 dang xay hoi. hieu ((va cam) or (ve cham)) ((duc van) or (thuc van)) hanh vi cua duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y dang xay hoi. hieu ((va cam) OR (ve cham)) ((duc van) OR (thuc van)) hanh vi cua duc.
• Adding a wildcard symbol may retrieve word variants: toc sach y dang xay hoi. hieu ((va cam) or (ve cham)) ((duc van) or (thuc van)) hanh vi cua duc*.