Perhaps you should try some spelling variations:
van thang » van thanh, van khang, van hang
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu kem » hieu ky, hieu ve
cau thuc » cau truc, cuu thuc, can thuc
thuc van » thuc vat, thuc dan, thuc va
thang di » hang di, tang di, thang loi
hieu ke » chieu ke, hieu ky, hieu ve
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ((y nang) or (ky nang)) xa hoi. ((hieu ke) OR (hieu kem)) cau thuc van thang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ((y nang) OR (ky nang)) xa hoi. ((hieu ke) OR (hieu kem)) cau thuc van thang di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ((y nang) or (ky nang)) xa hoi. ((hieu ke) OR (hieu kem)) cau thuc van thang di cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ((y nang) or (ky nang)) xa hoi. ((hieu ke) OR (hieu kem)) cau thuc van thang di cua tre*.