Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
hac duc » hoc duc, ha duc, thach duc
van hac » van hoc, van ha, van hai
cua tuc » cua duc, cua thuoc, luat tuc
sach ky » sac ky, sach ty, sach kem
nang o » nang co, nang ho, nang ro
cua tu » cua su, cua cu, cua te
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang o hoi. hieu van hac duc van thanh thai ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang o hoi. hieu van hac duc van thanh thai ((cua tu) OR (cua tuc))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang o hoi. hieu van hac duc van thanh thai ((cua tu) OR (cua tuc))*".