Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
thu hanh » thuc hanh, thu thanh, thuy hanh
va triet » va thiet, ve triet, cua triet
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
va cao » va cac, va co, va dao
ve cac » va cac, vien cac

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 thu hanh xa hoi. hieu ((ve cac) or (va cao)) tuc van hanh kem ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hanh xa hoi. hieu ((ve cac) OR (va cao)) tuc van hanh kem ((va triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu hanh xa hoi. hieu ((ve cac) or (va cao)) tuc van hanh kem ((va triet) or (va trien))*.