Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va triet » va thiet, va trien, ve triet
vien cac » vien bach, vien dai, vien da
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
vai va » mai va, dai va, hai va
ve cac » va 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) or (thuoc sach)) ky dang xa hoi. hieu ((ve cac) or (vien cac)) tuc van hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky dang xa hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky dang xa hoi. hieu ((ve cac) or (vien cac)) tuc van hanh vai va triet*.