Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, v nang
cau tu » cau truc
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 x ho. hieu van ((cau tu) OR (dau tu)) ((ban thanh) or (va danh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x ho. hieu van ((cau tu) OR (dau tu)) ((ban thanh) OR (va danh)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang x ho. hieu van ((cau tu) OR (dau tu)) ((ban thanh) or (va danh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x ho. hieu van ((cau tu) OR (dau tu)) ((ban thanh) or (va danh)) ki su triet*.