Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
danh va » doanh va, hanh va, anh va
sai ky » sac ky
va cau » van cau, va cac, va dau
va cua » va chua, via cua, ca cua
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: tu ((sach ty) or (sai ky)) nang x hoi. lieu va cau ((truc va) OR (thuc va)) danh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sai ky)) nang x hoi. lieu va cau ((truc va) OR (thuc va)) danh va cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sai ky)) nang x hoi. lieu va cau ((truc va) OR (thuc va)) danh va cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sai ky)) nang x hoi. lieu va cau ((truc va) OR (thuc va)) danh va cua viet*.