Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo

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 ty) OR (sach y)) nang x ho. hieu va cac duc va hanh dai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) nang x ho. hieu va cac duc va hanh dai cuu tre*".