Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xanh tai » hanh tai, anh tai, vanh tai
va triet » va thiet, va trien, cua triet
ve triet » va trien, su triet
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, tuc xa, duc va
va co » vo co

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va co ((tuc va) OR (truc va)) xanh tai ((va triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu va co ((tuc va) OR (truc va)) xanh tai ((va triet) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va co ((tuc va) OR (truc va)) xanh tai ((va triet) or (ve triet))*.