Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
thu sach » thuat sach, thuoc sach, thu hoach
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
lang mai » lang dai, lang hai, lang man
hieu van » hieu va, thien van, lieu va
lam tuc » lam truoc, luat tuc, nam thuc
mai hoi » mai khoi, dai hoi, lai hoi
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
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: ((thu sach) or (tu sach)) y lang mai hoi. hieu van ((lam tuc) OR (lam thuoc)) va thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y lang mai hoi. hieu van ((lam tuc) OR (lam thuoc)) va thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) y lang mai hoi. hieu van ((lam tuc) OR (lam thuoc)) va thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) y lang mai hoi. hieu van ((lam tuc) OR (lam thuoc)) va thanh ve cua tre*.