Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
tham nang » nham nang, tham lang, tham nhung
sach tham » sach nha
van cau » van dau, van hau, van chat
vai cau » va cau, vai cac, lai chau
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma

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 tham nang xa hoi. ((hieu ve) or (hieu va)) cham thuc va danh ((vai cau) or (van cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham nang xa hoi. ((hieu ve) OR (hieu va)) cham thuc va danh ((vai cau) OR (van cau)) tren.
• Adding a wildcard symbol may retrieve word variants: tu sach tham nang xa hoi. ((hieu ve) or (hieu va)) cham thuc va danh ((vai cau) or (van cau)) tren*.