Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
dinh tai » dinh toai, dinh tri, dinh thi
kinh tai » hinh tai, kinh hai, kinh tam
co sach » cuon sach, hoc sach
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang
bo sach » hoc sach
ve cac » va cac, vien 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 thuc va ((kinh tai) OR (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 thuc va ((kinh tai) OR (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 thuc va ((kinh tai) OR (dinh tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (bo sach)) ly hang xa hoi. hieu ve cac thuc va ((kinh tai) OR (dinh tai)) cuu tre*.