Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau duc » cao duc, cau luc, chu duc
tai cua » thai cua, tai cuc, tri cua
va phan » van phan, va phat, va phap
va hanh » van hanh, va thanh, va danh
van cau » van dau, van hau, van chat
sach ky » sac ky, sach ty, sach kem
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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 (sach y)) nang x hoi. hieu van cau duc ((va hanh) or (va phan)) tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang x hoi. hieu van cau duc ((va hanh) OR (va phan)) tai cua tu.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. hieu van cau duc ((va hanh) or (va phan)) tai cua tu*.