Perhaps you should try some spelling variations:
nang hoa » nang hoat, hang hoa, nang hoc
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hoa hoi » khoa hoi, hoa hoc, hoa doi
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
loc va » hoc va, luc va
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang hoa hoi. hieu ((ve cam) or (ve cac)) loc va danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang hoa hoi. hieu ((ve cam) OR (ve cac)) loc va danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang hoa hoi. hieu ((ve cam) or (ve cac)) loc va danh vi cau tren*.