Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc dan » thuoc dang, thuc dan, thuoc ban
vu sach » vu bach, su sach, vu khach
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
te cua » tue cua, le cua
de cua » le cua, dieu cua
ve nam » he nam, va nam, le nam
y nang » ky nang, v nang, may nang

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 ((y nang) OR (ly nang)) xa hoi. hieu ve nam thuoc dan thanh ((de cua) or (te cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (ly nang)) xa hoi. hieu ve nam thuoc dan thanh ((de cua) OR (te cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((y nang) OR (ly nang)) xa hoi. hieu ve nam thuoc dan thanh ((de cua) or (te cua)) te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) OR (ly nang)) xa hoi. hieu ve nam thuoc dan thanh ((de cua) or (te cua)) te*.