Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
chat cua » chat va, chat huu, ca cua
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang

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 y nang cao hoi. hieu va cac xuc ((va hanh) or (va thanh)) ((chat cua) OR (nhat cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang cao hoi. hieu va cac xuc ((va hanh) OR (va thanh)) ((chat cua) OR (nhat cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoi. hieu va cac xuc ((va hanh) or (va thanh)) ((chat cua) OR (nhat cua)) viet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. hieu va cac xuc ((va hanh) or (va thanh)) ((chat cua) OR (nhat cua)) viet*.