Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
nhan luu » nhan luc, nhan lupus, nhan luan
te sach » toc sach
va nhan » van nhan, ca nhan, va phan
luu van » cuu van, luan van, luu hanh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (nang x)) hoi. hieu va nhan luu van hanh vi ((su triet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (nang x)) hoi. hieu va nhan luu van hanh vi ((su triet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (nang x)) hoi. hieu va nhan luu van hanh vi ((su triet) or (hoa viet))*.