Perhaps you should try some spelling variations:
thanh lam » thanh lap, thanh nam, thanh tam
su triet » su viet, su tien, ve triet
hanh lam » thanh lap, hanh kem, hanh va
hieu van » hieu va, thien van, lieu va
duc gia » quoc gia
cau duc » cao duc, cau luc, chu duc
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
nang mo » nang meo, nang co, bang mo
van cau » van dau, van hau, van chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang mo) or (nang ma)) hoc. hieu van cau duc gia ((thanh lam) OR (hanh lam)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang mo) OR (nang ma)) hoc. hieu van cau duc gia ((thanh lam) OR (hanh lam)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang mo) or (nang ma)) hoc. hieu van cau duc gia ((thanh lam) OR (hanh lam)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang mo) or (nang ma)) hoc. hieu van cau duc gia ((thanh lam) OR (hanh lam)) su triet*.