Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
nuoc sach » nguoi sach, hoc sach, cuoc cach
dinh viet » ninh viet, danh viet, sinh vien
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
xang ma » tang ma, nang ma, sang ma
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 ty xang ma hoi. hieu ve cac duc va ((dinh viet) OR (trinh viet)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ty xang ma hoi. hieu ve cac duc va ((dinh viet) OR (trinh viet)) ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ty xang ma hoi. hieu ve cac duc va ((dinh viet) OR (trinh viet)) ((cua tre) or (cua te))*".