Perhaps you should try some spelling variations:
ve triet » va trien, su triet
su sach » so sach, vu sach
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
hanh vu » hanh vi, hanh va, hanh tu
tu sach » thu sach, te sach, tu cach
ma hoi » mai hoi, xa hoi, ma hoa
va coc » va cuoc, va cac, va hoc
vu ve » vu le, vu va, su ve

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 (su sach)) ky sang ma hoi. hieu va coc ((luc van) OR (duc van)) hanh vu ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky sang ma hoi. hieu va coc ((luc van) OR (duc van)) hanh vu ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky sang ma hoi. hieu va coc ((luc van) OR (duc van)) hanh vu ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky sang ma hoi. hieu va coc ((luc van) OR (duc van)) hanh vu ve triet*.