Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cac thuc » cach thuc, cac thu, can thuc
ve triet » va trien, su triet
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh de » hanh de, dan de, dang de
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky lang) or (ky dang)) xa hoi. hieu vien cac thuc va danh de ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky lang) OR (ky dang)) xa hoi. hieu vien cac thuc va danh de ve triet.
• Adding a wildcard symbol may retrieve word variants: te sac ((ky lang) or (ky dang)) xa hoi. hieu vien cac thuc va danh de ve triet*.