Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham loc » cham soc, chon loc, cham o
cau tren » cu tren, dau tren, ca tren
va nang » van nang, da nang, cam nang
tinh vi » trinh vi, tinh voi, dinh vi
tinh va » tich va, trinh van, trinh vat
va cham » va chat, va tham
ho hoi » hoc hoi, hoa hoi, hoi hoi
v nang » vu nang, van nang, voi nang
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((v nang) or (va nang)) ho hoi. lieu va cham loc va ((tinh vi) OR (tinh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((v nang) OR (va nang)) ho hoi. lieu va cham loc va ((tinh vi) OR (tinh va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((v nang) or (va nang)) ho hoi. lieu va cham loc va ((tinh vi) OR (tinh va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) or (va nang)) ho hoi. lieu va cham loc va ((tinh vi) OR (tinh va)) cau tren*.