Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
cuu duoc » cuu dac, che duoc, co duoc
cau duc » cao duc, cau luc, chu duc
sach ky » sach y, sach ty, sach kem
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
lam su » lai su, lam so, lam vu
o hai » co hai, so hai, o lai

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 ky) or (sac ky)) nang o hai. hieu van ((cau duc) or (cuu duoc)) ban thanh lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang o hai. hieu van ((cau duc) OR (cuu duoc)) ban thanh lam su triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang o hai. hieu van ((cau duc) or (cuu duoc)) ban thanh lam su triet*.