Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
ve triet » va trien, su triet
sach ky » sach y, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
cam luu » tam luu
luu van » cuu van, luan van, luu hanh
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
tai ve » tai va, tai he, tai le

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sac ky)) tang xa hoi. hieu va cam luu van thanh tai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sac ky)) tang xa hoi. hieu va cam luu van thanh tai ve triet.
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sac ky)) tang xa hoi. hieu va cam luu van thanh tai ve triet*.