Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh oai » thanh hai, thanh toan, thanh hoa
cua viet » ca viet, hoa viet, cua vat
nhan luc » nang luc
hieu ca » hieu cac, hieu cua, hieu va
sach ty » sach y, sach tu, sach thu
tang ma » tang van
su sach » so sach, vu sach
luc va » duc va, tuc va, loc va

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 ((tang ma) or (mang may)) hoa. hieu ca nhan luc va ((thanh oai) or (thanh tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((tang ma) OR (mang may)) hoa. hieu ca nhan luc va ((thanh oai) OR (thanh tai)) cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((tang ma) or (mang may)) hoa. hieu ca nhan luc va ((thanh oai) or (thanh tai)) cua viet*.