Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
hieu vi » hieu voi, hieu va, hieu ve
sach tu » cach tu, sach ty, sach uu
duy may » dung may, duy thay
duy mai » duy ai, duy thai
tinh di » tinh doi, trinh di, tinh da
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: tu ((sach tu) or (sach thu)) nang xa hoi. hieu vi pham ((duy may) OR (duy mai)) tinh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach thu)) nang xa hoi. hieu vi pham ((duy may) OR (duy mai)) tinh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach thu)) nang xa hoi. hieu vi pham ((duy may) OR (duy mai)) tinh di cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach thu)) nang xa hoi. hieu vi pham ((duy may) OR (duy mai)) tinh di cua viet*.