Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
te sach » toc sach
doi cua » dai cua, hoi cua
vu nang » vuc nang, va nang, vu dang
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, van nang, voi 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 (vu 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 (vu nang)) o hoi. hieu va cam ((luc va) OR (tuc va)) thanh doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((v nang) OR (vu 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 (vu nang)) o hoi. hieu va cam ((luc va) or (tuc va)) thanh doi cua te*.