Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
cau viet » ca viet, chu viet, cao viet
thuoc va » thuc va, thuoc ma, thuong va
hieu van » thien van, lieu va, hieu ve
nang ma » tang ma, sang ma, nang cao
sach lo » sach dao, sach doi, sach hoi
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
tu sach » thu sach, su sach, te sach
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach lo ((nang xa) OR (nang ma)) hoi. ((hieu van) or (hieu va)) nha thuoc va hanh di cau viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo ((nang xa) OR (nang ma)) hoi. ((hieu van) OR (hieu va)) nha thuoc va hanh di cau viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo ((nang xa) OR (nang ma)) hoi. ((hieu van) or (hieu va)) nha thuoc va hanh di cau viet".
• Adding a wildcard symbol may retrieve word variants: tu sach lo ((nang xa) OR (nang ma)) hoi. ((hieu van) or (hieu va)) nha thuoc va hanh di cau viet*.