Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
hanh di » hanh vi, hanh de, hang di
mua van » ma van, mua ban, mua dan
nam mua » nam cua, nam qua, nam xua
lieu ha » lieu nha, lieu va, liem ha
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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) OR (thu sach)) ((ky tang) or (ky dang)) xa hoi. lieu ha nam mua van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ((ky tang) OR (ky dang)) xa hoi. lieu ha nam mua van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ((ky tang) or (ky dang)) xa hoi. lieu ha nam mua van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ((ky tang) or (ky dang)) xa hoi. lieu ha nam mua van hanh di cua tre*.