Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » hang tai, han tai, hinh tai
va triet » va thiet, va trien, ve triet
hay hoi » tay hoi, hay hon, hay noi
hieu ve » hieu va, hieu van
ly anh » le anh
cac tu » cac thu, cach tu, cac du
tu van » tu va
ky anh » ky danh, ty anh
ve cac » va cac, vien cac

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 ((ky anh) or (ly anh)) hay hoi. hieu ve cac tu van ((hanh tai) or (thanh tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky anh) OR (ly anh)) hay hoi. hieu ve cac tu van ((hanh tai) OR (thanh tai)) va triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky anh) or (ly anh)) hay hoi. hieu ve cac tu van ((hanh tai) or (thanh tai)) va triet*.