Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
cac thuc » cach thuc, cac thu, can thuc
va thanh » gia thanh, ban thanh, va tinh
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
va hanh » van hanh, va danh, ban hanh
tai cua » tai cuc, tri cua, dai cua
x hoi » xa hoi, o hoi, x ho

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 thi nang x hoi. lieu va cac thuc ((va hanh) or (va thanh)) ((tai cua) OR (thai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi nang x hoi. lieu va cac thuc ((va hanh) OR (va thanh)) ((tai cua) OR (thai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi nang x hoi. lieu va cac thuc ((va hanh) or (va thanh)) ((tai cua) OR (thai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach thi nang x hoi. lieu va cac thuc ((va hanh) or (va thanh)) ((tai cua) OR (thai cua)) triet*.