Perhaps you should try some spelling variations:
nang doc » nang luc
le triet » ve triet, le tien, le viet
su sach » so sach, vu sach
doc hoi » duoc hoi, hoc hoi, doc hai
suc van » su van, luc van, sac van
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
sach 2 » sach y
2 nang » v nang
va le » va de, vu le

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach 2 nang doc hoi. lieu va cac ((suc van) or (duc van)) hanh va le triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 nang doc hoi. lieu va cac ((suc van) OR (duc van)) hanh va le triet.
• Adding a wildcard symbol may retrieve word variants: su sach 2 nang doc hoi. lieu va cac ((suc van) or (duc van)) hanh va le triet*.