Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thanh le » thinh le, thanh ve, thanh de
thanh ly » thanh lay, thanh ky, khanh ly
thuc ban » thuoc ban, thuc dan, thu ban
tu sach » thu sach, su sach, te sach
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
hang ca » hang va, nang cao, hang tai
hang xa » hoang xa, hang va, lang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((hang xa) or (hang ca)) hoi. hieu ve tham thuc ban ((thanh ly) OR (thanh le)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((hang xa) OR (hang ca)) hoi. hieu ve tham thuc ban ((thanh ly) OR (thanh le)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((hang xa) or (hang ca)) hoi. hieu ve tham thuc ban ((thanh ly) OR (thanh le)) cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((hang xa) or (hang ca)) hoi. hieu ve tham thuc ban ((thanh ly) OR (thanh le)) cua vat*.