Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu cao » chieu cao, hieu ca, kieu cao
danh dau » lanh dao, hang dau, danh tu
cap truc » cau truc, tap trac, tap tuc
hieu cac » hieu luc, hieu va, hieu van
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
dau cau » mau cau, dat cau, da cau
co hoi » co hoc, co loi
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: thu sach ky nang ((x hoi) or (co hoi)). ((hieu cao) or (hieu cac)) cap truc va danh dau cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (co hoi)). ((hieu cao) OR (hieu cac)) cap truc va danh dau cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) or (co hoi)). ((hieu cao) or (hieu cac)) cap truc va danh dau cau tren*.