Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
truc nang » truc nano, tru nang, truc trang
ban hanh » ban hang
cuc ban » cua ban, cac ban, cuu ban
tu sach » thu sach, su sach, te sach
van lam » van nam
van cam » van nam, van cau, van dam
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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 truc nang ma hoi. hieu ((van cam) or (van lam)) cuc ban hanh ((di cua) or (hoi chuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach truc nang ma hoi. hieu ((van cam) OR (van lam)) cuc ban hanh ((di cua) OR (hoi chuc)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach truc nang ma hoi. hieu ((van cam) or (van lam)) cuc ban hanh ((di cua) or (hoi chuc)) tre*.