Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cham xuc » chat xuc, cham soc, pham duc
cau tren » cu tren, dau tren, ca tren
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va cau » van cau, va cac, va dau
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: bo sach ky nang x hoi. ((hieu van) OR (hieu va)) ((cham xuc) or (cam xuc)) va hanh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang x hoi. ((hieu van) OR (hieu va)) ((cham xuc) OR (cam xuc)) va hanh va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky nang x hoi. ((hieu van) OR (hieu va)) ((cham xuc) or (cam xuc)) va hanh va cau tren".
• Adding a wildcard symbol may retrieve word variants: bo sach ky nang x hoi. ((hieu van) OR (hieu va)) ((cham xuc) or (cam xuc)) va hanh va cau tren*.