Perhaps you should try some spelling variations:
ban hanh » ban hang
dau luan » dan luan, dat luan, khau luan
tu sach » thu sach, su sach, te sach
dan luu » dan luan, dan luat
sach ly » sach y, sach lo, sach ty
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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 ly nang xa hoi. hieu qua ((dau luan) or (dan luu)) ban hanh ((di cua) or (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. hieu qua ((dau luan) OR (dan luu)) ban hanh ((di cua) OR (de cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. hieu qua ((dau luan) or (dan luu)) ban hanh ((di cua) or (de cua)) tre*.