Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
tai cuu » tai cuc, tai buu, tai cua
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach kem
dau hoi » dai hoi, dan hoi, dau noi
sach ty » sach y, sach tu, sach thu
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va

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) or (sach ty)) nang ((dau hoi) or (cau hoi)). hieu va cam luc va hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang ((dau hoi) OR (cau hoi)). hieu va cam luc va hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang ((dau hoi) or (cau hoi)). hieu va cam luc va hanh tai cuu tre*.