Perhaps you should try some spelling variations:
doanh vang » doanh van, doanh sang, doanh quang
vang cua » mang cua, hang cua, tang cua
toc sach » hoc sach, doc sach, thuoc sach
toc sac » toc san, hoc sach, doc sach
hieu ve » hieu va, hieu van
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac
tuc va » thuc va, truc va, duc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) or (toc sach)) ky dang ha hoi. hieu ve cac ((tuc va) OR (tuc xa)) doanh vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (toc sach)) ky dang ha hoi. hieu ve cac ((tuc va) OR (tuc xa)) doanh vang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) or (toc sach)) ky dang ha hoi. hieu ve cac ((tuc va) OR (tuc xa)) doanh vang cua tre*".