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

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