Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
thu san » thuy san, thu ban, phu san
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
san ky » sang ky, van ky, dan ky
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: thu san ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) or (hieu van)) cac duc va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu van)) cac duc va hanh dai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu san ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) or (hieu van)) cac duc va hanh dai cua tu*".