Perhaps you should try some spelling variations:
tinh cuu » trinh cuu, dinh cuu, tinh cua
van hanh » van thanh, ban hanh, van anh
cuu tre » cua tre, cau tren, cau treo
va hanh » va thanh, va danh, ban hanh
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
xac hoi » xa hoi, cac thoi, cac khoi
te sach » toc sach
tu sac » tu sach, tu cac, tu san
ky va » ly va, ke va, my va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (te sach)) ky va xac hoi. hieu va cac tuc ((va hanh) OR (van hanh)) tinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (te sach)) ky va xac hoi. hieu va cac tuc ((va hanh) OR (van hanh)) tinh cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (te sach)) ky va xac hoi. hieu va cac tuc ((va hanh) OR (van hanh)) tinh cuu tre*".