Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nganh hai
nhanh ha » thanh hoa, thanh hai, khanh hoa
tu sach » thu sach, te sach, tu cach
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ho nang » thi nang, kha nang, cao nang
su sach » so sach, vu sach
cua tu » cua tuc, cua su, cua cu

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) or (su sach)) ho nang xa hoi. hieu va cac duc van ((nhanh hai) OR (nhanh ha)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ho nang xa hoi. hieu va cac duc van ((nhanh hai) OR (nhanh ha)) cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ho nang xa hoi. hieu va cac duc van ((nhanh hai) OR (nhanh ha)) cua tu*".