Perhaps you should try some spelling variations:
den thanh » de thanh, dinh thanh, dong thanh
thanh dai » thanh hai, thanh tai, thanh dat
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
cuu den » cuu de, cau den, buu dien
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang x hoi. hieu ((ve cham) or (vu cham)) cuu den thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ((ve cham) OR (vu cham)) cuu den thanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ((ve cham) or (vu cham)) cuu den thanh dai cua te*.