Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vanh dai » van dai, vanh tai, lanh dao
va vanh » va van, va danh, va hanh
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
y lang » o lang, _ lang, tay lang
xuc va » duc va, tuc va, luc va
dai su » dai sua, dai so, dan su
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: tu sach y lang ((mai hoi) or (dai hoi)). hieu ((ve cac) or (ve cham)) xuc va vanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang ((mai hoi) OR (dai hoi)). hieu ((ve cac) OR (ve cham)) xuc va vanh dai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y lang ((mai hoi) or (dai hoi)). hieu ((ve cac) or (ve cham)) xuc va vanh dai su triet*.