Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
cau luc » cau truc, cau phuc
cau duc » cao duc, chu duc, cau truc
tu sach » thu sach, su sach, te sach
nang ro » nang ho, nang ra, nang rong
nang co » nang cao, nang doc, nang noi
lam su » lai su, lam so, lam vu

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