Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xuc ngan » luc ngan, luc nganh, cua ngan
te sach » toc sach
bang va » hang va, ban va, trang va
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cu tren » tu tren, dua tren
x hoi » xa hoi, o hoi, x ho
va cu » va cau, va chu, va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ty nang x hoi. hieu ve cham ((xuc ngan) OR (vu ngan)) bang va cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ty nang x hoi. hieu ve cham ((xuc ngan) OR (vu ngan)) bang va cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ty nang x hoi. hieu ve cham ((xuc ngan) OR (vu ngan)) bang va cu tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ty nang x hoi. hieu ve cham ((xuc ngan) OR (vu ngan)) bang va cu tren*.