Perhaps you should try some spelling variations:
vien dai » hien dai
va thanh » gia thanh, ban thanh, va tinh
thanh de » hanh de, thanh ve, thanh do
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
de cua » le cua, te cua, dieu cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu ((ve cac) or (vien dai)) luc va thanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ((ve cac) OR (vien dai)) luc va thanh de cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ((ve cac) or (vien dai)) luc va thanh de cua te*.