Perhaps you should try some spelling variations:
ve triet » va trien, su triet
tuan vai » tuan tai, trang vai, tuan khai
van tuan » van quan, van ban, anh tuan
cam duc » cam xuc, cao duc, nam duoc
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
vai ve » va ve, dai ve, vai va

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) or (nang x)) hoi. hieu ve ((cam duc) or (pham duc)) van tuan vai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (nang x)) hoi. hieu ve ((cam duc) OR (pham duc)) van tuan vai ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang ma) or (nang x)) hoi. hieu ve ((cam duc) or (pham duc)) van tuan vai ve triet*.