Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
va hanh » van hanh, va danh, ban hanh
cu tren » tu tren, dua tren
y nang » ky nang, v nang, may nang
va nam » van nam, ha nam, va nay
nam tu » nam thu, nam thuc
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 ((y nang) OR (ly nang)) x ho. lieu va nam tu ((va hanh) or (va thanh)) vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) x ho. lieu va nam tu ((va hanh) OR (va thanh)) vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) x ho. lieu va nam tu ((va hanh) or (va thanh)) vi cu tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) x ho. lieu va nam tu ((va hanh) or (va thanh)) vi cu tren*.