Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nang tai » hang tai, tang tai, sang tai
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, te sach
cu tren » tu tren, dua tren
sach ky » sac ky, sach y, sach ty
tai hoi » tai khoi, dai hoi, tai hai
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
vi cu » vi su, vi xu, vi du

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 nang tai hoi. lieu ((va cam) or (va cao)) luc ((van hanh) OR (van thanh)) vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang tai hoi. lieu ((va cam) OR (va cao)) luc ((van hanh) OR (van thanh)) vi cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang tai hoi. lieu ((va cam) or (va cao)) luc ((van hanh) OR (van thanh)) vi cu tren*".