Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
dieu cua » dieu tra
hoc sach » hoc sinh, hoc cac, hoc anh
dang tay » dang xay, dung tay, dan tay
thuoc va » thuc va, thuoc ma, thuong va
bo sach » co sach
tay hoi » tay ho, tao hoi, tay thai
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, va tinh
de cua » le cua, te cua
ve nam » he nam, va nam, le nam
y dang » ky dang, 2 dang, _ dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((bo sach) or (hoc sach)) y dang tay hoi. hieu ve nam thuoc va dinh ((de cua) OR (dieu cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (hoc sach)) y dang tay hoi. hieu ve nam thuoc va dinh ((de cua) OR (dieu cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (hoc sach)) y dang tay hoi. hieu ve nam thuoc va dinh ((de cua) OR (dieu cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (hoc sach)) y dang tay hoi. hieu ve nam thuoc va dinh ((de cua) OR (dieu cua)) te*.