Perhaps you should try some spelling variations:
dieu cua » dieu tra
ban hanh » ban hang
lang van » dang van, tang van, hoang van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
de cua » le cua, te 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 ky ((nang ma) or (lang van)) hoi. hieu va cac xuc ban hanh ((de cua) or (dieu cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (lang van)) hoi. hieu va cac xuc ban hanh ((de cua) OR (dieu cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (lang van)) hoi. hieu va cac xuc ban hanh ((de cua) or (dieu cua)) triet*.