Perhaps you should try some spelling variations:
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
hieu ca » hieu cac, hieu cua, hieu va
nam qua » nam quan, nam cua, nam mua
tai cua » thai cua, tri cua, dai cua
ca nam » cua nam, cai nam, ha nam
qua va » quan va, qua van, vua va
va han » va phan, van han, va hanh
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 ty)) nang x hoi. hieu ca nam qua va han ((tai cua) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ca nam qua va han ((tai cua) OR (tai cuc)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang x hoi. hieu ca nam qua va han ((tai cua) OR (tai cuc)) tre*".