Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thu sach » thuat sach, thuoc sach, thu hoach
cao cau » cao cap, co cau, tao cau
dao cao » dao tao, bao cao, tao cao
cam tuc » cam tu, nam thuc, dam thuc
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. hieu ve ((cam tuc) or (cam xuc)) ca dao cao cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu ve ((cam tuc) OR (cam xuc)) ca dao cao cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ma hoi. hieu ve ((cam tuc) or (cam xuc)) ca dao cao cau tren*.