Perhaps you should try some spelling variations:
trinh bay » trinh may, trinh bao, trinh ky
trinh ban » trinh han, trinh san, trinh dan
thu sach » tu sach, thuat sach, thuoc sach
hoc phan » hoc dan, hoc pho
lieu van » lieu va, hieu van, sieu van
van lam » van nam
lam hoc » am hoc, lam hoa, tam hoc
sach ky » sac ky, sach y, sach ty
lang ha » long ha
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((lang ha) or (nang x)) hoi. lieu van lam hoc phan ((trinh ban) or (trinh bay)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang ha) OR (nang x)) hoi. lieu van lam hoc phan ((trinh ban) OR (trinh bay)) cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang ha) or (nang x)) hoi. lieu van lam hoc phan ((trinh ban) or (trinh bay)) cua te*.