Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
lam chat » luan chat, cao chat, ly chat
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
xuc va » tuc va, luc va, xac 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 (thu sach)) ky nang xa hoi. hieu van bac ((xuc va) OR (duc va)) hanh lam chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu van bac ((xuc va) OR (duc va)) hanh lam chat triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang xa hoi. hieu van bac ((xuc va) OR (duc va)) hanh lam chat triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. hieu van bac ((xuc va) OR (duc va)) hanh lam chat triet*.