Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc va » thuc va, thuoc ma, thuong va
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
ve nam » he nam, va nam, le nam
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu ve nam thuoc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((((nang xa) OR (nang ma))) OR (lang xa)) hoi. hieu ve nam thuoc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu ve nam thuoc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((((nang xa) OR (nang ma))) or (lang xa)) hoi. hieu ve nam thuoc va hanh vi cua te*.