Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
nhan luc » nang luc
hang tai » hang va, dung tai
hinh tai » chinh tai, hinh thai, hinh bai
duc tre » duoc tren, duc tien
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ve nhan » ve nha, de nhan, va nhan
hieu ve » hieu va, hieu van
dang ma » dang mau, dang mam, dang mat
ty dang » ty xang, ky dang, ty hang
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty dang ma hoi. hieu ve nhan luc va ((hinh tai) or (hang tai)) ((duc tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang ma hoi. hieu ve nhan luc va ((hinh tai) OR (hang tai)) ((duc tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang ma hoi. hieu ve nhan luc va ((hinh tai) or (hang tai)) ((duc tre) or (va triet))*.