Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
ly nang » ky nang, ly hang, ly vang
van dam » van nam, van dao, van dau
va hanh » van hanh, va danh, ban hanh
y nang » ky nang, v nang, may nang
dam tu » nam tu, cam tu, tam tu
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((y nang) OR (ly nang)) x ho. hieu van dam tu ((va thanh) or (va hanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((y nang) OR (ly nang)) x ho. hieu van dam tu ((va thanh) OR (va hanh)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((y nang) OR (ly nang)) x ho. hieu van dam tu ((va thanh) or (va hanh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) OR (ly nang)) x ho. hieu van dam tu ((va thanh) or (va hanh)) ki su triet*.