Perhaps you should try some spelling variations:
hanh vinh » thanh vinh, khanh vinh, hanh tinh
toc sach » hoc sach, doc sach, thuoc sach
vinh cuu » dinh cuu, sinh cua, dinh cu
dang xay » dang van, van xay
tan hanh » tan thanh, tang hanh, toan hanh
van hac » van hoc, van ha, van hai
cuu tre » cua tre, cau tren, cau treo
van bac » van ban, van bao, dan bac
sach ky » sac ky, sach y, sach ty
van cac » van cau, dan cac, van ca
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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 xay hoi. hieu ((((van cac) OR (van bac))) or (van hac)) duc tan hanh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. hieu ((((van cac) OR (van bac))) OR (van hac)) duc tan hanh vinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xay hoi. hieu ((((van cac) OR (van bac))) or (van hac)) duc tan hanh vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. hieu ((((van cac) OR (van bac))) or (van hac)) duc tan hanh vinh cuu tre*.