Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cau tren » cu tren, dau tren, ca tren
cua viet » ca viet, hoa viet, cua dieu
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
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: thuat sach ky nang x hoi. hieu ve pham duc va hanh di ((cau tren) or (((cua viet) or (cua vat))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang x hoi. hieu ve pham duc va hanh di ((cau tren) OR (((cua viet) OR (cua vat)))).
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang x hoi. hieu ve pham duc va hanh di ((cau tren) or (((cua viet) or (cua vat))))*.