Perhaps you should try some spelling variations:
vien cach » vien bach, vien cac, vien canh
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, va triet
cach thuc » anh thuc, cac thu
van hang » van khang, van hoang, van thang
thuc van » thuc vat, thuc dan, thuc va
su triet » su viet, su tien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hang di » hang doi, hang vi, hang dien
su sach » so sach, vu sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang ((mai hoi) or (xa hoi)). hieu vien cach thuc van hang di ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((mai hoi) OR (xa hoi)). hieu vien cach thuc van hang di ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((mai hoi) or (xa hoi)). hieu vien cach thuc van hang di ((cua triet) or (su triet))*.