Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
chu tre » cho tre, chu tri, cuu tre
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ve tai » te tai, de tai, le tai
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va
va chu » va che, va cau, va chi
va cai » va cac, va bai, va dai

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 ky sang ma hoi. hieu ((((ve tai) or (va cai))) or (ve cham)) luc va hanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. hieu ((((ve tai) OR (va cai))) OR (ve cham)) luc va hanh va chu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. hieu ((((ve tai) or (va cai))) or (ve cham)) luc va hanh va chu tre*.