Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
chat duc » chat xuc, chat doc, chet duoc
va thanh » gia thanh, ban thanh, va tinh
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
lap cua » lai cua, tap cua, lam cua
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: thu sach ((ky sang) OR (ky dang)) xa hoi. ((hieu van) or (hieu va)) chat duc va thanh lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky sang) OR (ky dang)) xa hoi. ((hieu van) OR (hieu va)) chat duc va thanh lap cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) OR (ky dang)) xa hoi. ((hieu van) or (hieu va)) chat duc va thanh lap cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) OR (ky dang)) xa hoi. ((hieu van) or (hieu va)) chat duc va thanh lap cua tre*.