Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
nuoc sach » nguoi sach, hoc sach, cuoc cach
cao lang » cao dang, cao tang, cao bang
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, tao duoc
tu sach » thu sach, su sach, te sach
dinh ve » dinh ket, dinh van
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ve cua » le cua, de cua, te 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 (nuoc sach)) cao lang xa hoi. hieu van ((lam duoc) or (lam thuoc)) va dinh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (nuoc sach)) cao lang xa hoi. hieu van ((lam duoc) OR (lam thuoc)) va dinh ve cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (nuoc sach)) cao lang xa hoi. hieu van ((lam duoc) or (lam thuoc)) va dinh ve cua tre*.