Perhaps you should try some spelling variations:
kham thuc » nham thuc, pham thuc, tham thuc
cua viet » ca viet, hoa viet, cua dieu
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
sach ha » sach nha, sach han, sach xa
nang xa » lang xa, nang ma, mang xa

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 ha ((nang xa) or (nang x)) hoi. hieu va kham thuc va danh vai ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ha ((nang xa) OR (nang x)) hoi. hieu va kham thuc va danh vai ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ha ((nang xa) or (nang x)) hoi. hieu va kham thuc va danh vai ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: tu sach ha ((nang xa) or (nang x)) hoi. hieu va kham thuc va danh vai ((cua viet) OR (cua vat))*.