Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. ((hieu ve) OR (hieu van)) ((cam tuc) or (nam thuoc)) va hanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu ve) OR (hieu van)) ((cam tuc) OR (nam thuoc)) va hanh va cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu ve) OR (hieu van)) ((cam tuc) or (nam thuoc)) va hanh va cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu ve) OR (hieu van)) ((cam tuc) or (nam thuoc)) va hanh va cua viet*.