Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh hoa » thanh hoa, khanh hoa, hang hoa
hanh hoi » hanh thoi, hanh noi, hanh moi
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
van hoc » van hoa
luc van » luoc van, luu van, duc van
ty lang » tay lang, ty hang, tu lang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty lang) OR (ty xang)) van hoc. hieu qua cham luc van ((hanh hoi) or (hanh hoa)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty lang) OR (ty xang)) van hoc. hieu qua cham luc van ((hanh hoi) OR (hanh hoa)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty lang) OR (ty xang)) van hoc. hieu qua cham luc van ((hanh hoi) or (hanh hoa)) cua te*".