Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cam truc » cau truc, nam truc, lam truoc
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
ve cam » ve cham, ve cac, va cam
dai su » dai sua, dai so, dan su

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