Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
sach ky » sac ky, sach y, sach ty
cao hoa » cao hoat, cao khoa, cau hoa
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet
suc va » tuc va, luc va, soc va
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 ky nang cao hoa. ((hieu va) or (lieu va)) cao ((suc va) OR (duc va)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang cao hoa. ((hieu va) OR (lieu va)) cao ((suc va) OR (duc va)) thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang cao hoa. ((hieu va) or (lieu va)) cao ((suc va) OR (duc va)) thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang cao hoa. ((hieu va) or (lieu va)) cao ((suc va) OR (duc va)) thanh vi cua tre*.