Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
lo nang » ho nang, ly nang, loai nang
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
duc van » duc tan, duc manh, duc phan
hai cua » thai cua, dai cua, hoi cua
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)) lo nang xa hoi. hieu qua cac ((duc van) OR (duc va)) nhanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) lo nang xa hoi. hieu qua cac ((duc van) OR (duc va)) nhanh hai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) lo nang xa hoi. hieu qua cac ((duc van) OR (duc va)) nhanh hai cua tu*".