Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va dinh » van dinh, va kinh, va tinh
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
di cuu » di cua, dinh cuu
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang xa hoi. ((hieu van) OR (hieu va)) cau truc va dinh ((di cuu) or (di cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang xa hoi. ((hieu van) OR (hieu va)) cau truc va dinh ((di cuu) OR (di cau)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang xa hoi. ((hieu van) OR (hieu va)) cau truc va dinh ((di cuu) or (di cau)) tre*".