Perhaps you should try some spelling variations:
van thuc » va thuc, dan thuc, van thu
thuc dan » thuc hanh, hoc dan, thuc vat
thanh vi » thanh va, thanh ve, nhanh vi
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) OR (sach ty)) nang xa hoi. lieu va van thuc dan ((thanh vi) or (hanh vi)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach ty)) nang xa hoi. lieu va van thuc dan ((thanh vi) OR (hanh vi)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach ty)) nang xa hoi. lieu va van thuc dan ((thanh vi) or (hanh vi)) ca viet".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) OR (sach ty)) nang xa hoi. lieu va van thuc dan ((thanh vi) or (hanh vi)) ca viet*.