Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
xang cao » nang cao, lang cao, quang cao
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
thiet » thieu

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 xang cao hoi. hieu ve nham thuc va hanh ((dai va) or (mai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang cao hoi. hieu ve nham thuc va hanh ((dai va) OR (mai va)) thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang cao hoi. hieu ve nham thuc va hanh ((dai va) or (mai va)) thiet*.