Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
nang dai » nang dau, nang tai, lang dai
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
tu sach » su sach, te sach, tu cach
dai hoi » dai hoc, dai hai, dai moi
vu nang » vuc nang, va nang, vu dang
va chat » van chat, va phat, cao chat
va cao » va cac, va co, va dao
ki su » ky su

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) or (thu sach)) vu nang dai hoi. hieu ((va chat) or (va cao)) xuc van hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) vu nang dai hoi. hieu ((va chat) OR (va cao)) xuc van hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) vu nang dai hoi. hieu ((va chat) or (va cao)) xuc van hanh ki su triet*.