Perhaps you should try some spelling variations:
dieu cua » dieu tra
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
chat xu » chat xuc, chao xu, chat huu
va danh » va dinh, va dan, va hanh
de cua » le cua, te cua
xu va » xu van, tu va, su va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang cao hoi. hieu va chat xu va danh ((de cua) OR (dieu cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu va chat xu va danh ((de cua) OR (dieu cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu va chat xu va danh ((de cua) OR (dieu cua)) te*.