Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hang cau » hang dau, hang ca, nhung cau
hieu van » hieu va, thien van, lieu va
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, va hanh
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
ky hang » ky nang, ly hang, ky dang
su hai » su tai
su sai » su tai, su dai, su mai

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

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