Perhaps you should try some spelling variations:
thien van » thi van
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
cam tuc » cam tu, nam thuc, dam thuc
di cua » dai cua, doi cua, de cua
so sac » so sach, so dac
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
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: so sac ky nang o hoi. ((hieu van) or (thien van)) ((cam tuc) OR (cam xuc)) va thanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang o hoi. ((hieu van) OR (thien van)) ((cam tuc) OR (cam xuc)) va thanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang o hoi. ((hieu van) or (thien van)) ((cam tuc) OR (cam xuc)) va thanh di cua te".
• Adding a wildcard symbol may retrieve word variants: so sac ky nang o hoi. ((hieu van) or (thien van)) ((cam tuc) OR (cam xuc)) va thanh di cua te*.