Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hanh vai » hanh vi, hanh va, hanh tai
vu sach » vu bach, su sach, vu khach
thuc va » thuc vat, thuc dan, thuc day
vai cua » dai cua, hai cua, lai cua
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
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: ((vu sach) or (hoc cac)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cham thuc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (hoc cac)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cham thuc va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (hoc cac)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cham thuc va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (hoc cac)) ky nang xa hoi. ((hieu ve) OR (hieu va)) cham thuc va hanh vai cua te*.