Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu viec » nhieu viec, hieu ve, sieu viet
xa thanh » va thanh, ha thanh, ta thanh
viec cac » vien cac, viec cua, viec lam
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac tac » cac toc, cac bac, cac dac
tac xa » tuc xa, tac da
x hoi » o hoi, x ho, 5 hoi
ve va » ve van, te va, le va
ke va » te va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ty nang ((x hoi) or (xa hoi)). hieu viec cac tac xa thanh ((ve va) OR (ke va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty nang ((x hoi) OR (xa hoi)). hieu viec cac tac xa thanh ((ve va) OR (ke va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ty nang ((x hoi) or (xa hoi)). hieu viec cac tac xa thanh ((ve va) OR (ke va)) triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang ((x hoi) or (xa hoi)). hieu viec cac tac xa thanh ((ve va) OR (ke va)) triet*.