Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
cau luc » cau phuc
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sach v » sach va, sach y, sach 2
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach v ((nang xa) OR (nang ma)) hoi. hieu qua ((cau luc) or (cau truc)) van hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v ((nang xa) OR (nang ma)) hoi. hieu qua ((cau luc) OR (cau truc)) van hanh tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v ((nang xa) OR (nang ma)) hoi. hieu qua ((cau luc) or (cau truc)) van hanh tai cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach v ((nang xa) OR (nang ma)) hoi. hieu qua ((cau luc) or (cau truc)) van hanh tai cua tu*.