Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
san viet » gian viet, anh viet
lang xa » lang ha, dang xay, lang van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
nang xa » nang x, nang ma, mang xa
hanh li » nhanh li, hanh vi, han li
ve cac » va cac, vien cac
li san » di san, ly san, li yan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky ((nang xa) or (lang xa)) hoi. hieu ((ve cham) or (ve cac)) xuc van hanh li san viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky ((nang xa) OR (lang xa)) hoi. hieu ((ve cham) OR (ve cac)) xuc van hanh li san viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((nang xa) or (lang xa)) hoi. hieu ((ve cham) or (ve cac)) xuc van hanh li san viet*.