Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
thuc van » thuc dan, thuc va, thuc hanh
viec dat » vien dai, vien da, viec lam
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) OR (lang xa)) hoi. hieu viec dat ((thuc van) or (thuc vat)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang xa)) hoi. hieu viec dat ((thuc van) OR (thuc vat)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) OR (lang xa)) hoi. hieu viec dat ((thuc van) or (thuc vat)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) OR (lang xa)) hoi. hieu viec dat ((thuc van) or (thuc vat)) hanh di cua tre*.