Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu van
sach ty » sach y, sach tu, sach thu
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua

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 ty nang xa hoi. ((hieu ve) or (hieu va)) cac nuoc ((va dinh) or (va thanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. ((hieu ve) OR (hieu va)) cac nuoc ((va dinh) OR (va thanh)) vi cua viet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. ((hieu ve) or (hieu va)) cac nuoc ((va dinh) or (va thanh)) vi cua viet*.