Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
phan duc » pham duc, phan tu, phan dau
tiep cua » tiep can, dieu cua, tiep va
va thanh » gia thanh, ban thanh, va tinh
tap cua » tap quan
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
tao hoi » tao khoi, tao boi, tay hoi
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky sang) or (ky tang)) tao hoi. hieu ve phan duc va thanh ((tap cua) or (tiep cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky sang) OR (ky tang)) tao hoi. hieu ve phan duc va thanh ((tap cua) OR (tiep cua)) te.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky sang) or (ky tang)) tao hoi. hieu ve phan duc va thanh ((tap cua) or (tiep cua)) te*.