Perhaps you should try some spelling variations:
cac thoi » cac toi, cac hop, cac tro
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lai cuu » lai cua, lai chau, lai cuoc
dan lai » dan loai, dan lap, dan lat
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau

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 ky sang ma hoi. ((hieu ve) or (hieu va)) ((cac tuc) or (cac thoi)) va dan lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. ((hieu ve) OR (hieu va)) ((cac tuc) OR (cac thoi)) va dan lai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. ((hieu ve) or (hieu va)) ((cac tuc) or (cac thoi)) va dan lai cuu tre*.