Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang cau » nang cao, hang cau, nang dau
va thanh » gia thanh, ban thanh, va tinh
cao suc » cao su, cao duc
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cau hoa » cau hoi
suc va » duc va, tuc va, luc va
vi 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 cau hoa. ((hieu va) or (lieu va)) cao suc va thanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang cau hoa. ((hieu va) OR (lieu va)) cao suc va thanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang cau hoa. ((hieu va) or (lieu va)) cao suc va thanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang cau hoa. ((hieu va) or (lieu va)) cao suc va thanh ((vi cua) OR (vai cua)) tre*.