Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cau tren » cu tren, dau tren, ca tren
so lang » o lang, so dang, hoa lang
ky lang » ky dang, ky tang, tay lang
cac dac » cac dan, cac dai, cac bac
va hanh » van hanh, va thanh, va danh
dac va » duc va, day va, dat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so lang ((ky lang) OR (ky nang)) xa hoi. hieu vien cac dac va hanh vi ((cua triet) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so lang ((ky lang) OR (ky nang)) xa hoi. hieu vien cac dac va hanh vi ((cua triet) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so lang ((ky lang) OR (ky nang)) xa hoi. hieu vien cac dac va hanh vi ((cua triet) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: so lang ((ky lang) OR (ky nang)) xa hoi. hieu vien cac dac va hanh vi ((cua triet) or (cau tren))*.