Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
cac truc » cac tru, cac trung, sach truc
hanh de » hanh ve, hanh kem
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach 2 » sach y
2 nang » v nang

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 2 nang xa hoi. hieu ve ((cac truc) OR (cau truc)) van hanh de ((cua triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach 2 nang xa hoi. hieu ve ((cac truc) OR (cau truc)) van hanh de ((cua triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach 2 nang xa hoi. hieu ve ((cac truc) OR (cau truc)) van hanh de ((cua triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach 2 nang xa hoi. hieu ve ((cac truc) OR (cau truc)) van hanh de ((cua triet) or (ve triet))*.