Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh dai » trinh dai, tinh da, tinh hai
sach thu » sach thue, sach thieu, sach tham
duy mai » duy ai, duy thai
duy may » dung may, duy thay
sach tu » cach tu, sach ty, sach uu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve pham » vi pham, v pham, ve phan

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 ve pham ((duy may) or (duy mai)) tinh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach thu)) nang xa hoi. hieu ve pham ((duy may) OR (duy mai)) tinh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach thu)) nang xa hoi. hieu ve pham ((duy may) or (duy mai)) tinh dai cua triet*.