Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh tai » doanh tai, dinh tai, hanh tai
ky danh » ky anh
xay hoi » xa hoi, tay hoi, cay phoi
qua hai » qua hoat
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
ky dang » ky nang
tai cua » thai cua, tai cuc, tri cua
cua te » cua tu

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 ((ky dang) or (ky danh)) xay hoi. hieu qua hai ((truc va) or (thuc va)) danh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky dang) OR (ky danh)) xay hoi. hieu qua hai ((truc va) OR (thuc va)) danh tai cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky dang) or (ky danh)) xay hoi. hieu qua hai ((truc va) or (thuc va)) danh tai cua te*.