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
ly nang » ky nang, ly hang, ly vang
van dau » phan dau
sach ly » sach y, sach lo, sach ty
de cua » le cua, te cua, dieu cua
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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