Perhaps you should try some spelling variations:
tay lang » tai lang, tay tang, tay quang
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
ty lang » ty xang, ty hang, tu lang
van dat » van dao, van dau, dan dat
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
va sua » va su, va suc
nuoc » quoc, duoc, ngoc
chua » cua, chu

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 (thu sach)) ((ty lang) OR (tay lang)) xa hoi. hieu van dat nuoc va tinh va sua chua~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ((ty lang) OR (tay lang)) xa hoi. hieu van dat nuoc va tinh va sua chua.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ((ty lang) OR (tay lang)) xa hoi. hieu van dat nuoc va tinh va sua chua".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ((ty lang) OR (tay lang)) xa hoi. hieu van dat nuoc va tinh va sua chua*.