Perhaps you should try some spelling variations:
su triet » su viet, su tien
nang doc » nang luc
ve triet » va trien
van hanh » van thanh, ban hanh, van anh
vao truc » vao thuc, cau truc, dao tuc
va hanh » va thanh, va danh, ban hanh
su sach » so sach, vu sach
doc hoi » duoc hoi, hoc hoi, doc hai
sach v » sach va, sach y, sach 2
va vao » va van, va dao, va bao
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang doc hoi. lieu va vao truc ((va hanh) or (van hanh)) vi ((ve triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang doc hoi. lieu va vao truc ((va hanh) OR (van hanh)) vi ((ve triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang doc hoi. lieu va vao truc ((va hanh) or (van hanh)) vi ((ve triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach v nang doc hoi. lieu va vao truc ((va hanh) or (van hanh)) vi ((ve triet) OR (su triet))*.