Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
sach thi » sach thu, sach tai, sach thieu
va triet » va thiet, ve triet, cua triet
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
vien cac » vien bach, vien dai, vien da
thi hanh » thi thanh
hanh xa » hanh va, hanh ma, hanh xu
tu sach » thu sach, su sach, te sach
ve cam » ve cham, ve cac, va cam

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 thi hanh xa hoi. hieu ((ve cam) or (vien cac)) truc van hanh lam ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. hieu ((ve cam) OR (vien cac)) truc van hanh lam ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hanh xa hoi. hieu ((ve cam) or (vien cac)) truc van hanh lam ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ((ve cam) or (vien cac)) truc van hanh lam ((va triet) OR (va trien))*.