Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
dang luc » nang luc, dong luc, dang duc
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu dang » su dang, vu quang, cua dang
va hanh » va thanh, va danh, ban hanh
sach v » sach va, sach 2, sach vay

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) or (sach y)) nang xa hoi. hieu vu dang luc ((va hanh) OR (van hanh)) lai chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) nang xa hoi. hieu vu dang luc ((va hanh) OR (van hanh)) lai chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) or (sach y)) nang xa hoi. hieu vu dang luc ((va hanh) OR (van hanh)) lai chau triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach y)) nang xa hoi. hieu vu dang luc ((va hanh) OR (van hanh)) lai chau triet*.