Perhaps you should try some spelling variations:
cac tren » ca tren, cau tren, rac tren
tinh ve » trinh ve, tinh ven, dinh ve
va tinh » may tinh
cam luc » cau luc
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
ve cac » va cac, vien cac

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 (su sach)) ky nang xa hoi. hieu ve ((cam luc) or (cam xuc)) va tinh ve cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu ve ((cam luc) OR (cam xuc)) va tinh ve cac tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. hieu ve ((cam luc) or (cam xuc)) va tinh ve cac tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. hieu ve ((cam luc) or (cam xuc)) va tinh ve cac tren*.