Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
va hanh » van hanh, va danh, ban hanh
sach ty » sach y, sach tu, sach thu
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
ve cau » ke cau, va cau, ve cac
vi cua » vai cua, di cua
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

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

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