Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ho hoi » hoc hoi, hoa hoi, hoi hoi
ve cam » ve cham, ve cac, va cam

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 ho hoi. hieu ve cam duc va hanh vi ((((cua tre) or (cua viet))) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ho hoi. hieu ve cam duc va hanh vi ((((cua tre) OR (cua viet))) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ho hoi. hieu ve cam duc va hanh vi ((((cua tre) or (cua viet))) or (cau tren))*.