Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
vinh cuu » dinh cuu, sinh cua, dinh cu
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
vi cuu » vi luu
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu va ((nam thuc) or (nha thuoc)) van hanh ((vi cuu) OR (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu va ((nam thuc) OR (nha thuoc)) van hanh ((vi cuu) OR (vinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu va ((nam thuc) or (nha thuoc)) van hanh ((vi cuu) OR (vinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu va ((nam thuc) or (nha thuoc)) van hanh ((vi cuu) OR (vinh cuu)) tre*.