Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
nuoc sach » nguoi sach, hoc sach, cuoc cach
toc sach » hoc sach, doc sach, thuoc sach
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
ve cham » va cham, ve chat, vu cham
ha hoi » hoa hoi, ha noi, xa hoi
doi su » oi su, don su, voi su
di su » ki su, da su, de su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (nuoc sach)) ky lang ha hoi. hieu ve cham thuc va danh ((di su) OR (doi su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (nuoc sach)) ky lang ha hoi. hieu ve cham thuc va danh ((di su) OR (doi su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (nuoc sach)) ky lang ha hoi. hieu ve cham thuc va danh ((di su) OR (doi su)) triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (nuoc sach)) ky lang ha hoi. hieu ve cham thuc va danh ((di su) OR (doi su)) triet*.