Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc van » thuc vat, thuc dan, thuc hanh
thuc va » thuc vat, thuc dan, thuc day
van cac » van hac, van cau, van bac
vu sach » vu bach, vu khach
danh xa » danh ca, dinh xa, canh xa
ky danh » ky anh, ky dang
su sach » so sach
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ky danh xa hoi. hieu van cac ((thuc van) or (thuc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky danh xa hoi. hieu van cac ((thuc van) OR (thuc va)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky danh xa hoi. hieu van cac ((thuc van) or (thuc va)) hanh vi cuu tre*.