Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
va cua » va chua, via cua, ca cua

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

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