Perhaps you should try some spelling variations:
dien cua » dieu cua, dien cuc, dien cu
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
cau tuc » cau truc, cau tu, cau luc
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va danh, ban hanh
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ve cau » ke cau, va cau, ve cac
cua te » cua tu
o hoc » co hoc, mo hoc, so hoc
o hoi » co hoi, o hai, o hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((o hoi) OR (o hoc)). hieu ve cau tuc ((va hanh) OR (va thanh)) dien cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((o hoi) or (o hoc)). hieu ve cau tuc ((va hanh) OR (va thanh)) dien cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((o hoi) or (o hoc)). hieu ve cau tuc ((va hanh) OR (va thanh)) dien cua te*.