Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
cac luc » cau luc, cac nuoc, cac cuoc
vai su » va su, van su, lai su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang x) or (lang xa)) hoi. hieu van ((cac luc) or (coc luc)) va thanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang x) OR (lang xa)) hoi. hieu van ((cac luc) OR (coc luc)) va thanh vai su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang x) or (lang xa)) hoi. hieu van ((cac luc) or (coc luc)) va thanh vai su triet*.