Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
sach thu » sach thue, sach thieu, sach tham
hanh hai » thanh hai, hang hai, hanh tai
so sach » so sanh, bo sach, co sach
cac tuc » cac toc, cac tu, cac tac
lang ha » long ha
mang xa » lang xa, mang may, dang xay
tuc va » thuc va, truc va, tuc xa
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: so sach thu ((mang xa) or (lang ha)) hoi. hieu viec cac tuc va ((hanh hai) OR (nhanh hai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((mang xa) OR (lang ha)) hoi. hieu viec cac tuc va ((hanh hai) OR (nhanh hai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu ((mang xa) or (lang ha)) hoi. hieu viec cac tuc va ((hanh hai) OR (nhanh hai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach thu ((mang xa) or (lang ha)) hoi. hieu viec cac tuc va ((hanh hai) OR (nhanh hai)) cua tu*.