Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
van lam » van nam
loc va » luc va
va cau » van cau, va cac, va dau

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