Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
va cham » va chat, va tham
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hang de » hoang de, hanh de, hang di
va hang » van hang, va nang, va lang
de cua » le cua, te cua, dieu cua
luc va » duc va, tuc va, loc va
va cam » va cac, va cao, va cai
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 nang ma hoi. hieu ((va cam) OR (va cham)) luc va hang de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ma hoi. hieu ((va cam) OR (va cham)) luc va hang de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ma hoi. hieu ((va cam) OR (va cham)) luc va hang de cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ma hoi. hieu ((va cam) OR (va cham)) luc va hang de cua te*.