Perhaps you should try some spelling variations:
doanh tang » doanh sang, doanh tong, doanh thanh
tang cua » mang cua, hang cua, tang luan
toc sach » hoc sach, doc sach, thuoc sach
nang hoa » nang hoat, hang hoa, nang hoc
toc sac » toc san, hoc sach, doc sach
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
tuc va » truc va, tuc xa, duc va
ve cac » va cac, vien cac

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 nang hoa hoi. hieu ve cac ((tuc va) or (thuc va)) doanh tang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (toc sach)) ky nang hoa hoi. hieu ve cac ((tuc va) OR (thuc va)) doanh tang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (toc sach)) ky nang hoa hoi. hieu ve cac ((tuc va) or (thuc va)) doanh tang cua tre*".