Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chat duc » chat xuc, chat doc, chet duoc
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va danh, ban hanh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky sang xa hoi. ((hieu van) or (hieu va)) chat duc ((va hanh) OR (va thanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky sang xa hoi. ((hieu van) OR (hieu va)) chat duc ((va hanh) OR (va thanh)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky sang xa hoi. ((hieu van) or (hieu va)) chat duc ((va hanh) OR (va thanh)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky sang xa hoi. ((hieu van) or (hieu va)) chat duc ((va hanh) OR (va thanh)) lai cua tre*.