Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cay phoi » cap phoi, tay hoi, cay cho
hieu van » hieu va, thien van, lieu va
lam luc » lao luc, lam duoc
hanh va » hanh vi
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
ky danh » ky anh
ky dang » ky nang
van lam » van nam

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