Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
tu sang » thu sang, tu san, tu lang
sang ky » sang kyo, dang ky, tang ky
hieu va » lieu va, hieu qua
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
nang o » nang co, nang ho, nang ro
di cua » dai cua, doi cua, de cua
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: tu sang ky nang o hoi. hieu va ((cam duc) or (cao duc)) va thanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sang ky nang o hoi. hieu va ((cam duc) OR (cao duc)) va thanh di cua te.
• Adding a wildcard symbol may retrieve word variants: tu sang ky nang o hoi. hieu va ((cam duc) or (cao duc)) va thanh di cua te*.