Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
ve nam » he nam, va nam, le nam
vi su » va su, ve su, oi su
ki su » ky su
kien » bien, vien, tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) lang xa hoi. hieu ve nam thuc va danh ((vi su) or (ki su)) kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) lang xa hoi. hieu ve nam thuc va danh ((vi su) OR (ki su)) kien.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) lang xa hoi. hieu ve nam thuc va danh ((vi su) or (ki su)) kien*.