Perhaps you should try some spelling variations:
cuu thuc » cuu tac
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
van cuu » van cau, van chu, van cu
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
di cuu » di cua, dinh cuu
di cau » diem cau
da cau » dat cau, va cau
vu sac » vu sach, vu san, va sac

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 cuu thuc va tinh ((di cuu) or (((di cau) OR (da cau)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang xa hoi. hieu van cuu thuc va tinh ((di cuu) OR (((di cau) OR (da cau)))) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang xa hoi. hieu van cuu thuc va tinh ((di cuu) or (((di cau) OR (da cau)))) tre*".