Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, hieu ve
ky danh » ky anh
tay hoi » tay ho, tao hoi, tay thai
lam luc » lao luc, lam duoc
luc van » luoc van, luu van, duc van
ky dang » ky nang
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky dang) or (ky danh)) tay hoi. ((hieu van) OR (lieu va)) lam luc van hanh va cau trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky danh)) tay hoi. ((hieu van) OR (lieu va)) lam luc van hanh va cau trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) or (ky danh)) tay hoi. ((hieu van) OR (lieu va)) lam luc van hanh va cau trieu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky danh)) tay hoi. ((hieu van) OR (lieu va)) lam luc van hanh va cau trieu*.