Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
xuc van » duc van, luc van, vuc van
sach ty » sach y, sach thu, xach tay
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
sach tu » sach thu, cach tu, sach uu
va cam » va cham, va cac, va cao
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: su ((sach ty) OR (sach tu)) xang xa hoi. hieu va cam xuc van ((trinh viet) or (sinh vien)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) xang xa hoi. hieu va cam xuc van ((trinh viet) OR (sinh vien)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach tu)) xang xa hoi. hieu va cam xuc van ((trinh viet) or (sinh vien)) cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach tu)) xang xa hoi. hieu va cam xuc van ((trinh viet) or (sinh vien)) cua te*.