Perhaps you should try some spelling variations:
lang mai » lang dai, lang hai, lang man
van dung » van dong, xay dung, tin dung
sang tai » hang tai, sang tao, tang tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
thu sac » thu sach, thu san, thu xac
cac xuc » cam xuc, chat xuc, cac cuoc
tai duc » tai cuc, mai duc, tai du
hieu ve » hieu va, hieu van
duc tre » duoc tren, duc tien
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((lang mai) or (sang tai)) hoi. hieu ve ((cac xuc) OR (cac nuoc)) van dung tai duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((lang mai) OR (sang tai)) hoi. hieu ve ((cac xuc) OR (cac nuoc)) van dung tai duc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky ((lang mai) or (sang tai)) hoi. hieu ve ((cac xuc) OR (cac nuoc)) van dung tai duc tre".
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((lang mai) or (sang tai)) hoi. hieu ve ((cac xuc) OR (cac nuoc)) van dung tai duc tre*.