Perhaps you should try some spelling variations:
nay thuoc » cay thuoc, nam thuoc, na thuoc
va tinh » may tinh
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
te sac » te sach, te san
va nay » va ngay, va cay
nang o » nang co, nang ho, nang ro
te cac » tu cac, ve cac, te cao
cua te » cua tu
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 sac) or (te cac)) ky nang o hoi. hieu va nay thuoc ((va hanh) or (va tinh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky nang o hoi. hieu va nay thuoc ((va hanh) OR (va tinh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky nang o hoi. hieu va nay thuoc ((va hanh) or (va tinh)) vi cua te*.