Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu ((nang x) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cham thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((nang x) OR (lang xa)) hoi. ((hieu ve) OR (hieu van)) cham thuc va hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((nang x) or (lang xa)) hoi. ((hieu ve) OR (hieu van)) cham thuc va hanh vi cua tre*".