Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, tu cach
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
nam tu » nam thu, nam thuc
x hoi » xa hoi, o hoi, x ho
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) OR (te sach)) ty nang x hoi. thien van nam tu va hanh vi cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty nang x hoi. thien van nam tu va hanh vi cu tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ty nang x hoi. thien van nam tu va hanh vi cu tren*.