Perhaps you should try some spelling variations:
dau triet » cau triet, dau tien, su triet
hieu van » hieu va, thien van, hieu ve
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
lam luc » lao luc, lam duoc
va hanh » va thanh, va danh, ban hanh
va dau » va dao

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 ky lang xa hoi. ((hieu van) or (lieu va)) lam luc ((va hanh) OR (van hanh)) va dau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu van) OR (lieu va)) lam luc ((va hanh) OR (van hanh)) va dau triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu van) or (lieu va)) lam luc ((va hanh) OR (van hanh)) va dau triet*".