Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh, thi nang
nam tu » nam thu, nam thuc
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. ((thien van) or (thi van)) nam tu va thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((thien van) OR (thi van)) nam tu va thanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((thien van) or (thi van)) nam tu va thanh vi cau tren*.