Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu hien » bieu hien, dieu hien, chieu chien
thanh vi » hanh vi, thanh va, thanh ve
chat xuc » chat huu, chao xu, chat cua
hoc viet » hoc hien
hang tai » hang va, dung tai
lang dai » lang hai, lang mai, lang chai
tu sach » thu sach, su sach, te sach
vi hoc » li hoc, va hoc

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 y ((hang tai) or (lang dai)) hoi. hieu hien ((chat xuc) or (cam xuc)) van thanh vi hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((hang tai) OR (lang dai)) hoi. hieu hien ((chat xuc) OR (cam xuc)) van thanh vi hoc viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((hang tai) or (lang dai)) hoi. hieu hien ((chat xuc) or (cam xuc)) van thanh vi hoc viet*.