Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sanh » do sanh
cam tuc » cam xuc, cam tu, nam thuc
nang ma » sang ma, nang cao, mang may
tinh di » tinh doi, trinh di, tinh da
tang ma » mang may, tang van
va tinh » may tinh
hieu ve » hieu va
sanh va » hanh va, anh va, sinh va
di cua » dai cua, doi cua, de cua
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh va ((nang ma) or (tang ma)) hoi. ((hieu ve) OR (hieu van)) cam tuc va tinh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh va ((nang ma) OR (tang ma)) hoi. ((hieu ve) OR (hieu van)) cam tuc va tinh di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh va ((nang ma) or (tang ma)) hoi. ((hieu ve) OR (hieu van)) cam tuc va tinh di cua tu".
• Adding a wildcard symbol may retrieve word variants: so sanh va ((nang ma) or (tang ma)) hoi. ((hieu ve) OR (hieu van)) cam tuc va tinh di cua tu*.