Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
cap nuoc » dat nuoc
toc sach » hoc sach, doc sach, thuoc sach
ly nang » ky nang, ly hang, ly vang
cao hoa » cao hoat, cao khoa, cau hoa
van cap » van cau, van dap, van ca
y nang » ky nang, v nang, may nang
tai va » thai va, mai va, tri va

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) OR (toc sach)) ((y nang) or (ly nang)) cao hoa. hieu van cap nuoc van hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((y nang) OR (ly nang)) cao hoa. hieu van cap nuoc van hanh tai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((y nang) or (ly nang)) cao hoa. hieu van cap nuoc van hanh tai va triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((y nang) or (ly nang)) cao hoa. hieu van cap nuoc van hanh tai va triet*.