Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
ty hang » ly hang, ty xang, thi hang
van cam » van lam, van cau, van dam
ty lang » tay lang, ty xang, tu lang
su sach » so sach, vu sach
loc va » hoc va, luc va
vi cau » va cau, ve cau, di cau

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 lang) OR (ty hang)) xa hoi. hieu ((van cam) or (van nam)) loc va thanh vi cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty lang) OR (ty hang)) xa hoi. hieu ((van cam) OR (van nam)) loc va thanh vi cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty lang) OR (ty hang)) xa hoi. hieu ((van cam) or (van nam)) loc va thanh vi cau theo".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty lang) OR (ty hang)) xa hoi. hieu ((van cam) or (van nam)) loc va thanh vi cau theo*.