Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh dai » thanh hai, thanh tai, thanh dat
thanh duc » thach duc, than duc, thinh duc
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
tao hoi » tao khoi, tao boi, tay hoi
ty nang » ky nang, ty xang, ty hang
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 ((tao hoi) or (cau hoi)). hieu van thanh duc va thanh dai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((tao hoi) OR (cau hoi)). hieu van thanh duc va thanh dai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((tao hoi) or (cau hoi)). hieu van thanh duc va thanh dai ((dua tren) or (cua te))*.