Perhaps you should try some spelling variations:
thanh vang » thanh van, thanh hang, thanh hoang
thuc dan » thuc hanh, thuc vat
vang cua » mang cua, hang cua, tang cua
ky dang » ky danh
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
su sac » su sach, su cac, su xac
cua tu » cua tuc, cua su, cua cu
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ky dang) OR (ky nang)) hoa hoi. hieu ve am ((thuc dan) or (hoc dan)) thanh vang cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky dang) OR (ky nang)) hoa hoi. hieu ve am ((thuc dan) OR (hoc dan)) thanh vang cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky dang) OR (ky nang)) hoa hoi. hieu ve am ((thuc dan) or (hoc dan)) thanh vang cua tu".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky dang) OR (ky nang)) hoa hoi. hieu ve am ((thuc dan) or (hoc dan)) thanh vang cua tu*.