Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
cham duc » pham duc, cham soc, pham duy
vu sach » vu bach, su sach, vu khach
tinh va » tich va, trinh van, tinh gia
su cham » su pham, tu cham, vu cham
sach tu » sach thu, cach tu, sach ty
hieu su » hieu sau, tieu su, hieu so
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
chua tu » chu tu, cua tu, chua cu

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