Perhaps you should try some spelling variations:
su sach » so sach, vu sach
tinh he » trinh he, hinh he, tinh ha
hieu ve » hieu va, hieu van
tinh de » tinh da, sinh de, minh de
cac duc » cac du, cao duc, cac dac
ve cac » va cac, vien cac
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
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 ((y nang) or (v nang)) xa hoi. hieu ve cac duc va ((tinh de) or (tinh he)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. hieu ve cac duc va ((tinh de) OR (tinh he)) cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) xa hoi. hieu ve cac duc va ((tinh de) or (tinh he)) cua te*.