Perhaps you should try some spelling variations:
dau tieng » cau tieng, day tieng, mau tieng
cac thuc » cach thuc, cac thu, can thuc
dau tien » van tien
te sach » toc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va luan » vay luan, van luan, va quan
luan vi » quan vi, luan va, luan ve
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: te sach ty xang xa hoi. hieu ve cac thuc va luan vi ((dau tieng) or (dau tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang xa hoi. hieu ve cac thuc va luan vi ((dau tieng) OR (dau tien)).
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. hieu ve cac thuc va luan vi ((dau tieng) or (dau tien))*.