Perhaps you should try some spelling variations:
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
nang xa » nang x, lang xa, nang ma
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cua te » cua tu
tuc va » thuc va, truc va, tuc xa
sach v » sach va, sach y, sach 2
va cam » va cham, va cao, va cai
v nang » va nang, vu nang, van nang

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