Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
cuc ban » cua ban, cac ban, duc ban
cuu ban » cuu van, cua ban, cuu san
va cam » va cham, va cac, va cao
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: te sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam ((cuc ban) or (cuu ban)) thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam ((cuc ban) OR (cuu ban)) thanh dai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ky nang)) xa hoi. hieu va cam ((cuc ban) or (cuu ban)) thanh dai cua te*".