Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
va triet » va thiet, ve triet, cua triet
hanh lam » thanh lap, hanh kem, hanh va
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
hanh xa » hanh va, hanh ma, hanh xu
tuc va » thuc va, truc va, duc va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thi hanh xa hoi. hieu va cam ((tuc va) or (tuc xa)) hanh lam ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi hanh xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh lam ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi hanh xa hoi. hieu va cam ((tuc va) or (tuc xa)) hanh lam ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: su sach thi hanh xa hoi. hieu va cam ((tuc va) or (tuc xa)) hanh lam ((va triet) OR (va trien))*.