Perhaps you should try some spelling variations:
te sach » toc sach
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cam luc » cam xuc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai
x hoi » xa 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 hang ((x hoi) OR (o hoi)). hieu ve ((cam luc) or (cau luc)) va hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hang ((x hoi) OR (o hoi)). hieu ve ((cam luc) OR (cau luc)) va hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty hang ((x hoi) OR (o hoi)). hieu ve ((cam luc) or (cau luc)) va hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach ty hang ((x hoi) OR (o hoi)). hieu ve ((cam luc) or (cau luc)) va hanh vi cua tu*.