Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
ve cai » va cai, ve tai, ve cau
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
tai su » tai so, tai tu, lai su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ma hoi. hieu ((ve cai) OR (ve cac)) xuc va hanh tai su triet~.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ma hoi. hieu ((ve cai) or (ve cac)) xuc va hanh tai su triet*.