Perhaps you should try some spelling variations:
hanh dieu » han dieu, hinh dieu, hoang dieu
thu sach » tu sach, thuat sach, thuoc sach
dieu cua » dieu tra
lang hoa » hang hoa, lang ha, nang hoa
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
hieu ve » hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ky lang hoa hoi. ((hieu ve) OR (hieu va)) am thuc va hanh dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky lang hoa hoi. ((hieu ve) OR (hieu va)) am thuc va hanh dieu cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky lang hoa hoi. ((hieu ve) OR (hieu va)) am thuc va hanh dieu cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky lang hoa hoi. ((hieu ve) OR (hieu va)) am thuc va hanh dieu cua tre*.