Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
khang ca » hang ca, khang a, khang cu
trinh le » trinh ly, thinh le, trinh he
va trinh » van trinh, va tinh, lap trinh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
vu sach » su sach, vu khach
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
ca hoi » cau hoi, cua hoi, xa hoi
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((vu sach) OR (vu bach))) or (so sanh)) thieu khang ca hoi. hieu va cac duc va trinh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu sach) OR (vu bach))) OR (so sanh)) thieu khang ca hoi. hieu va cac duc va trinh le cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((vu sach) OR (vu bach))) or (so sanh)) thieu khang ca hoi. hieu va cac duc va trinh le cua tre*".