Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
tinh di » tinh doi, trinh di, tinh da
tu van » tu va
so hai » son hai, su hai, so ha
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua
cua te » cua tu
o hai » co hai, o lai, _ 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 van ky nang ((o hai) OR (so hai)). hieu va cam ((tuc va) or (duc va)) tinh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu van ky nang ((o hai) OR (so hai)). hieu va cam ((tuc va) OR (duc va)) tinh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu van ky nang ((o hai) OR (so hai)). hieu va cam ((tuc va) or (duc va)) tinh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu van ky nang ((o hai) OR (so hai)). hieu va cam ((tuc va) or (duc va)) tinh di cua te*.