Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
van thanh » ban thanh, van tuan
thu sach » thuat sach, thuoc sach, thu hoach
thanh vi » hanh vi, thanh va, thanh ve
tham luc » than luc, tham nuoc, nhan luc
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu sach)) ky nang x hoi. hieu va ((tham luc) OR (tham thuc)) van thanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang x hoi. hieu va ((tham luc) OR (tham thuc)) van thanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) ky nang x hoi. hieu va ((tham luc) OR (tham thuc)) van thanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang x hoi. hieu va ((tham luc) OR (tham thuc)) van thanh vi va triet*.