Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
van cac » van hac, van bac, dan cac
vu sach » vu bach, vu khach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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 lang xa hoi. hieu ((van cac) OR (van cau)) 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 lang xa hoi. hieu ((van cac) OR (van cau)) thuc va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ky lang xa hoi. hieu ((van cac) OR (van cau)) thuc va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang xa hoi. hieu ((van cac) OR (van cau)) thuc va hanh vi cuu tre*.