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