Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thu sach » tu sach, thuat sach, thuoc sach
ty nang » ty xang, ty hang, ly nang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
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: thu sach ((ty nang) or (ky nang)) mai hoi. hieu ve cam ((xuc va) OR (duc va)) thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ky nang)) mai hoi. hieu ve cam ((xuc va) OR (duc va)) thanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) or (ky nang)) mai hoi. hieu ve cam ((xuc va) OR (duc va)) thanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ky nang)) mai hoi. hieu ve cam ((xuc va) OR (duc va)) thanh dai cua te*.