Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hang tai » hang va, dung 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 hang » van hang, va nang, va lang
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: thuoc sach ty nang ma hoi. hieu ((ve cai) OR (ve cac)) xuc va hang tai su triet~.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty nang ma hoi. hieu ((ve cai) or (ve cac)) xuc va hang tai su triet*.