Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
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 cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
y nang » ky nang, v nang, may nang
cam tu » cam thu, nam tu, dam 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 cam tu ((va hanh) or (va danh)) 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 cam tu ((va hanh) OR (va danh)) 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 cam tu ((va hanh) or (va danh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((y nang) OR (ly nang)) x ho. hieu van cam tu ((va hanh) or (va danh)) ki su triet*.