Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
thu sach » thuat sach, thuoc sach, thu hoach
danh tai » doanh tai, dinh tai, hanh tai
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
tai cuu » tai cuc, tai buu, tai cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang

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)) ky sang xa hoi. ((hieu ve) or (hieu va)) cham truc va danh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang xa hoi. ((hieu ve) OR (hieu va)) cham truc va danh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky sang xa hoi. ((hieu ve) or (hieu va)) cham truc va danh tai cuu tre*.