Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
cau tren » cu tren, dau tren, ca tren
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
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: thu sach ky nang x hoi. ((hieu va) or (hieu van)) pham duc va danh di ((cau tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. ((hieu va) OR (hieu van)) pham duc va danh di ((cau tren) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. ((hieu va) or (hieu van)) pham duc va danh di ((cau tren) or (cua viet))*.