Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
chat xuc » chat huu, cam xuc, chao xu
chat tuc » luat tuc, chat huu, chat cua
tran van » luan van
xa hanh » xa thanh, xa khanh, va hanh
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
tang xa » trang xa, tang ma, lang xa
dai va » mai va
thiet » thieu

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 ((tang xa) or (tran van)) hoi. hieu qua ((chat tuc) or (chat xuc)) xa hanh dai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((tang xa) OR (tran van)) hoi. hieu qua ((chat tuc) OR (chat xuc)) xa hanh dai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((tang xa) or (tran van)) hoi. hieu qua ((chat tuc) or (chat xuc)) xa hanh dai va thiet*.