Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
cac dac » cac dan, cac dai, cac bac
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
dac va » duc va, day va, dat va
v nang » va nang, vu nang, van nang
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) v nang xa hoi. hieu ve cac dac va thanh vi ((su triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) v nang xa hoi. hieu ve cac dac va thanh vi ((su triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) v nang xa hoi. hieu ve cac dac va thanh vi ((su triet) or (va thiet))*.