Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
duoc hoc » quoc hoi
chat xuc » chat huu, cam xuc, chao xu
cham xuc » cam xuc, cham soc, pham duc
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
doc hoc » toc hoc, duc hoc, hoc hoc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va cau » van cau, va cac, va dau

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 ((doc hoc) OR (duoc hoc)). hieu ve ((cham xuc) or (chat xuc)) va hanh va cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((doc hoc) OR (duoc hoc)). hieu ve ((cham xuc) OR (chat xuc)) va hanh va cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((doc hoc) OR (duoc hoc)). hieu ve ((cham xuc) or (chat xuc)) va hanh va cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((doc hoc) OR (duoc hoc)). hieu ve ((cham xuc) or (chat xuc)) va hanh va cau tren*.