Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
dinh toi » dinh tri, dinh thi, dinh moi
sach ty » sach y, sach tu, sach thu
toi cua » troi cua, tri cua, hoi cua
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
tuc va » truc va, tuc xa, duc va
ve cac » va cac
cua te » cua tu

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 hoi. hieu ((ve cac) or (vien cac)) ((tuc va) OR (thuc va)) dinh toi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ((ve cac) OR (vien cac)) ((tuc va) OR (thuc va)) dinh toi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu ((ve cac) or (vien cac)) ((tuc va) OR (thuc va)) dinh toi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ((ve cac) or (vien cac)) ((tuc va) OR (thuc va)) dinh toi cua te*.