Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
van am » van nam, van lam, van dam
di cua » dai cua, de cua, do cua

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) or (cac ky)) lang xa hoi. hieu van am thuc va hanh ((di cua) OR (doi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (cac ky)) lang xa hoi. hieu van am thuc va hanh ((di cua) OR (doi cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (cac ky)) lang xa hoi. hieu van am thuc va hanh ((di cua) OR (doi cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (cac ky)) lang xa hoi. hieu van am thuc va hanh ((di cua) OR (doi cua)) triet*.