Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
vu khach » vu khanh, vu khac, vay khach
trinh di » trinh do, trinh dien, trinh dinh
cac duc » cac du, cao duc, cac dac
tinh di » tinh doi, tinh da, tin di
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (thuat san)) ky nang xa hoi. hieu ve cac duc va ((tinh di) OR (trinh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (thuat san)) ky nang xa hoi. hieu ve cac duc va ((tinh di) OR (trinh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (thuat san)) ky nang xa hoi. hieu ve cac duc va ((tinh di) OR (trinh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (thuat san)) ky nang xa hoi. hieu ve cac duc va ((tinh di) OR (trinh di)) cua tre*.