Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cau treo » cau tren, cau triet, cau trieu
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
tang tai » hang tai, dung tai, sang tao
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
tai hoi » tai khoi, dai hoi, tai hai
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (su sach)) ky tang tai hoi. hieu va cac duc va thanh vi ((cau treo) OR (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (su sach)) ky tang tai hoi. hieu va cac duc va thanh vi ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (su sach)) ky tang tai hoi. hieu va cac duc va thanh vi ((cau treo) OR (cau theo))".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (su sach)) ky tang tai hoi. hieu va cac duc va thanh vi ((cau treo) OR (cau theo))*.