Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
su sach » so sach, vu sach
lam cua » nam cua, lam chat
hang x » nang x, hoang xa, chang xu
va cao » va cac, va co, va dao
cao tu » cao thu, co tu, cao su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (su sach)) ty hang x ho. hieu va cao tu ((van hanh) OR (van thanh)) lam cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (su sach)) ty hang x ho. hieu va cao tu ((van hanh) OR (van thanh)) lam cua vat*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (su sach)) ty hang x ho. hieu va cao tu ((van hanh) OR (van thanh)) lam cua vat*".