Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cau treo » cau theo, cau tren, cau triet
ban hanh » ban hang
te sach » toc sach
duc ban » duc tan, duc van, dua ban
hanh di » hanh vi, hanh de, hang di
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuat sach)) ky nang xa hoi. hieu ve cac duc ban hanh di ((cau treo) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky nang xa hoi. hieu ve cac duc ban hanh di ((cau treo) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky nang xa hoi. hieu ve cac duc ban hanh di ((cau treo) or (ca viet))*.