Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
tham thuc » nham thuc, pham thuc, tam thuc
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
ve tham » va tham, ve cham, vi tham
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
thi hai » thi mai, thi hanh
tai hai » dai hai, tai ha, tai phan
ky tang » ky nang, ky dang, kho tang
cua te » cua tu
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang ((tai hai) OR (thi hai)). hieu ve tham thuc va thanh dam ((cua te) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ((tai hai) OR (thi hai)). hieu ve tham thuc va thanh dam ((cua te) OR (cua cu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ((tai hai) OR (thi hai)). hieu ve tham thuc va thanh dam ((cua te) or (cua cu))".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ((tai hai) OR (thi hai)). hieu ve tham thuc va thanh dam ((cua te) or (cua cu))*.