Perhaps you should try some spelling variations:
thanh gian » thanh giang, thach giang, thanh san
ve triet » va trien, su triet
sach thu » sach thue, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
dang xay » dang van, van xay
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
gian ve » gian viet
tu sach » thu sach, su sach, te sach
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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 thu ((dang xay) or (sang ma)) hoi. hieu ve cac luc va thanh gian ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((dang xay) OR (sang ma)) hoi. hieu ve cac luc va thanh gian ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((dang xay) or (sang ma)) hoi. hieu ve cac luc va thanh gian ve triet*.