Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cham duc » cham soc, pham duy, phan duc
sach ty » sach y, sach tu, sach thu
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu van
hieu va » lieu va, hieu qua
x hoi » xa hoi, o hoi, x ho
di va » dai va, di vao, doi 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 ty nang x hoi. ((hieu ve) OR (hieu va)) ((cham duc) or (pham duc)) va danh di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. ((hieu ve) OR (hieu va)) ((cham duc) OR (pham duc)) va danh di va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. ((hieu ve) OR (hieu va)) ((cham duc) or (pham duc)) va danh di va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. ((hieu ve) OR (hieu va)) ((cham duc) or (pham duc)) va danh di va triet*.