Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
lang dai » lang hai, lang mai, lang chai
hanh hai » nhanh hai, hang hai, hanh tai
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
ve cac » va cac, vien cac
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: so sach ky ((lang dai) or (nang luc)) hoi. hieu ve cac luc van ((hanh hai) OR (thanh hai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((lang dai) OR (nang luc)) hoi. hieu ve cac luc van ((hanh hai) OR (thanh hai)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((lang dai) or (nang luc)) hoi. hieu ve cac luc van ((hanh hai) OR (thanh hai)) cua te*".