Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
vuc nang » cuc nang, vu nang, chuc nang
te sach » toc sach
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
luc va » duc va, loc va
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, van nang
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 ((v nang) or (vuc nang)) o hoi. hieu va cam ((luc va) or (tuc va)) thanh doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((v nang) OR (vuc nang)) o hoi. hieu va cam ((luc va) OR (tuc va)) thanh doi cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) or (vuc nang)) o hoi. hieu va cam ((luc va) or (tuc va)) thanh doi cua te*.