Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
te sach » toc sach
ty lang » tay lang, ty hang, tu lang
qua lam » cua lam, qua la, qua lao
duoc va » nuoc va, duc va, duoc ma
va hang » van hang, va nang, va lang
va cua » va chua, via cua, ma cua
ca cua » co cua

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 ((ty lang) or (ty xang)) xa hoi. hieu qua lam duoc va hang ((va cua) OR (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (ty xang)) xa hoi. hieu qua lam duoc va hang ((va cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty lang) or (ty xang)) xa hoi. hieu qua lam duoc va hang ((va cua) OR (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (ty xang)) xa hoi. hieu qua lam duoc va hang ((va cua) OR (ca cua)) tre*.