Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
cau tren » cu tren, dau tren, ca tren
nang doc » nang luc
thuoc la » thuoc ma, thuoc va, thuoc tai
hanh di » hanh vi, hanh de, hang di
la hanh » va hanh, lu hanh, ly hanh
tu sach » thu sach, su sach, te sach
thi van » thi lan, thi hanh, thi nang
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
doc hoi » duoc hoi, hoc hoi, doc hai
di cau » da cau, diem cau

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 doc hoi. ((hieu va) or (((thien van) or (thi van)))) nha thuoc la hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang doc hoi. ((hieu va) OR (((thien van) OR (thi van)))) nha thuoc la hanh di cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang doc hoi. ((hieu va) or (((thien van) or (thi van)))) nha thuoc la hanh di cau tren*.