Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
tinh va » tich va, trinh van, tinh gia
vu cham » va cham, vu kham, tu cham
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
nang xa » lang xa, nang ma, mang xa
chua te » cua te, chua tu, chua xe

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 ty ((nang xa) or (nang x)) hoi. hieu vu cham duc va ((tinh va) OR (trinh vat)) chua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. hieu vu cham duc va ((tinh va) OR (trinh vat)) chua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. hieu vu cham duc va ((tinh va) OR (trinh vat)) chua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. hieu vu cham duc va ((tinh va) OR (trinh vat)) chua te*.