Perhaps you should try some spelling variations:
van chat » cao chat
su sach » vu sach
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cao luc » bao luc, cao duc, cao suc
van cau » van dau, van hau, toan cau
ve cao » va cao, ve bao, ve cac
canh » anh, can, hanh

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) or (so sach)) ty nang xa hoi. hieu ve cao luc canh tranh ((van cau) OR (van chat)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang xa hoi. hieu ve cao luc canh tranh ((van cau) OR (van chat)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ty nang xa hoi. hieu ve cao luc canh tranh ((van cau) OR (van chat)) viet*".