Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ninh viet » sinh vien, anh viet
viet cua » viec cua, viet ca, viet qua
cham loc » cham soc, chon loc, cham o
va ninh » van ninh, va kinh, va tinh
tu sach » thu sach, su sach, tu cach
hieu va » lieu va
nang xa » nang x, lang xa, nang ma
te sach » toc sach
loc va » hoc va, luc va

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) or (te sach)) ky nang xa hoi. ((hieu va) OR (hieu qua)) cham loc va ninh viet cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang xa hoi. ((hieu va) OR (hieu qua)) cham loc va ninh viet cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang xa hoi. ((hieu va) OR (hieu qua)) cham loc va ninh viet cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang xa hoi. ((hieu va) OR (hieu qua)) cham loc va ninh viet cua triet*.