Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
chau tren » cau tren, chay tren, cu tren
thu sach » tu sach, thuat sach, thuoc sach
duc manh » suc manh, duc minh, duc tan
hai chau » lai chau, ha chau, hat chau
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, 5 hoi

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 ((x hoi) or (x ho)). hieu ve cam ((duc manh) OR (duc anh)) nhanh hai chau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang ((x hoi) OR (x ho)). hieu ve cam ((duc manh) OR (duc anh)) nhanh hai chau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang ((x hoi) or (x ho)). hieu ve cam ((duc manh) OR (duc anh)) nhanh hai chau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang ((x hoi) or (x ho)). hieu ve cam ((duc manh) OR (duc anh)) nhanh hai chau tren*.