Perhaps you should try some spelling variations:
cham duc » cham soc, pham duy, phan duc
va xanh » va danh, va hanh, va anh
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
doi va » hoi va, noi va, dai va
x hoi » xa hoi, o hoi, x ho
di va » dai va, di vao, di vat

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 ty nang x hoi. hieu ve ((cham duc) or (pham duc)) va xanh ((di va) OR (doi va)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ve ((cham duc) OR (pham duc)) va xanh ((di va) OR (doi va)) trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu ve ((cham duc) or (pham duc)) va xanh ((di va) OR (doi va)) trien".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ve ((cham duc) or (pham duc)) va xanh ((di va) OR (doi va)) trien*.