Perhaps you should try some spelling variations:
ve triet » va trien, su triet
ban hanh » ban hang
phan day » phan dau, phap day, phan xay
sach ty » sach y, sach thu, xach tay
day ban » tay ban, da ban, day dan
va phan » van phan, va phat, va phap
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach uu
su viet » so viet

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) or (sach tu)) lang xa hoi. hieu va phan day ban hanh vi ((ve triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc ((sach ty) OR (sach tu)) lang xa hoi. hieu va phan day ban hanh vi ((ve triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: nuoc ((sach ty) or (sach tu)) lang xa hoi. hieu va phan day ban hanh vi ((ve triet) or (su viet))*.