Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
pham duy » pham duc
xach tay » canh tay
tinh de » tinh da, sinh de, tinh he
duy may » duy mai, dung may, duy thay
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va pham » van pham, va phat, va phap

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 (xach tay)) nang xa hoi. hieu va pham duy may tinh de ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (xach tay)) nang xa hoi. hieu va pham duy may tinh de ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (xach tay)) nang xa hoi. hieu va pham duy may tinh de ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (xach tay)) nang xa hoi. hieu va pham duy may tinh de ((cua triet) OR (va triet))*.