Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
vien dai » hien dai
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
de cua » le cua, te cua, dieu cua
luc va » tuc va, loc va
ve cac » va cac, vien cac
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) OR (duc 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) OR (duc va)) thanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. hieu ((ve cac) or (vien dai)) ((luc va) OR (duc 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) OR (duc va)) thanh de cua te*.