Perhaps you should try some spelling variations:
hieu va » hieu qua
tinh di » tinh doi, trinh di, tinh da
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
nang o » nang co, nang ho, nang ro
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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 san ky nang o hoi. ((hieu va) or (lieu va)) cam ((xuc va) OR (tuc va)) tinh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang o hoi. ((hieu va) OR (lieu va)) cam ((xuc va) OR (tuc va)) tinh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang o hoi. ((hieu va) or (lieu va)) cam ((xuc va) OR (tuc va)) tinh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang o hoi. ((hieu va) or (lieu va)) cam ((xuc va) OR (tuc va)) tinh di cua te*.