Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thuc van » thuc vat, thuc dan, thuc va
van hang » van khang, van hoang, van thang
su sach » so sach, vu sach
sang ma » tang ma, nang ma, sang tao
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
di cua » doi cua, de cua, do cua

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 y ((sang ma) or (nang x)) hoi. hieu vu cham thuc van hang ((di cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((sang ma) OR (nang x)) hoi. hieu vu cham thuc van hang ((di cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: su sach y ((sang ma) or (nang x)) hoi. hieu vu cham thuc van hang ((di cua) or (dai cua)) te*.