Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
tu thanh » thu thanh, su thanh, ta thanh
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
tai hoi » tai khoi, tai hai, tai hoe
ky sang » ky nang, ky dang, ky tang
tuc tu » thuc tu, truc tu, luc tu
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang ((tai hoi) OR (dai hoi)). hieu ve cam tuc tu thanh dai ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ((tai hoi) OR (dai hoi)). hieu ve cam tuc tu thanh dai ((va triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ((tai hoi) OR (dai hoi)). hieu ve cam tuc tu thanh dai ((va triet) or (ve triet))*".