Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
dinh tai » dinh toai, dinh tri, dinh thi
co sach » cuon sach, hoc sach
tai cuu » tai cuc, tai buu, tai cua
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang
bo sach » hoc sach
ve cac » va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (bo sach)) ly hang xa hoi. hieu ((ve cac) OR (vien cac)) thuc va dinh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (bo sach)) ly hang xa hoi. hieu ((ve cac) OR (vien cac)) thuc va dinh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) or (bo sach)) ly hang xa hoi. hieu ((ve cac) OR (vien cac)) thuc va dinh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (bo sach)) ly hang xa hoi. hieu ((ve cac) OR (vien cac)) thuc va dinh tai cuu tre*.