Perhaps you should try some spelling variations:
thuoc ban » thuoc tan, thuoc dang, thu ban
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach kem
ve cuu » ve chu, ve cua, ve cum
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sach ty)) nang xa hoi. hieu van nam thuoc ban hang ((ve cuu) OR (ve cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sach ty)) nang xa hoi. hieu van nam thuoc ban hang ((ve cuu) OR (ve cau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) or (sach ty)) nang xa hoi. hieu van nam thuoc ban hang ((ve cuu) OR (ve cau)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sach ty)) nang xa hoi. hieu van nam thuoc ban hang ((ve cuu) OR (ve cau)) tre*.