Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua nuoc » cua quoc, cua nguoi, cua thuoc
thu sach » thuat sach, thuoc sach, thu hoach
lang mai » lang dai, lang hai, lang man
xuc van » duc van, luc van, xuc ban
vai cua » dai cua, hai cua, lai cua
vuc van » duc van, luc van, thuc van
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cam » ve cham, ve cac, va cam
y lang » o lang, _ lang, tay lang

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)) y lang mai hoi. hieu ve cam ((xuc van) OR (vuc van)) thanh vai cua nuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y lang mai hoi. hieu ve cam ((xuc van) OR (vuc van)) thanh vai cua nuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y lang mai hoi. hieu ve cam ((xuc van) OR (vuc van)) thanh vai cua nuoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y lang mai hoi. hieu ve cam ((xuc van) OR (vuc van)) thanh vai cua nuoc*.