Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
cham tuc » nham thuc, pham thuc, cham soc
co sach » bo sach, cuon sach, hoc sach
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
tu sach » thu sach, su sach, te sach
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 (co sach)) ky nang x hoi. hieu van ((cham tuc) OR (tham thuc)) va tinh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky nang x hoi. hieu van ((cham tuc) OR (tham thuc)) va tinh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (co sach)) ky nang x hoi. hieu van ((cham tuc) OR (tham thuc)) va tinh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ky nang x hoi. hieu van ((cham tuc) OR (tham thuc)) va tinh vi cua viet*.