Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
trinh van » trinh han, trinh quan, trinh toan
canh thuc » anh thuc, cach thuc, danh thuc
vien canh » bien canh, vien can, vien nganh
va trinh » van trinh, va tinh, lap trinh
van chu » van chi, van phu, van cau
thuc va » thuc vat, thuc dan, thuc day
sach ky » sach y, sach ty, sach kem
xay hoi » tay hoi, cay phoi, gay thoi
chu tre » cho tre, chu tri, cuu tre
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang ((xay hoi) OR (xa hoi)). hieu vien canh thuc va trinh van chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ((xay hoi) OR (xa hoi)). hieu vien canh thuc va trinh van chu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang ((xay hoi) OR (xa hoi)). hieu vien canh thuc va trinh van chu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ((xay hoi) OR (xa hoi)). hieu vien canh thuc va trinh van chu tre*.