Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
doc sach » hoc sach, toc sach, nuoc sach
danh vai » danh sai, danh va, doanh van
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
duoc va » nuoc va, duc va, duoc ma
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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

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