Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh tai, hanh van
thuc van » thuc vat, thuc dan, thuc va
cac thuc » cach thuc, cac thu, can thuc
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
vu sach » vu bach, su sach, vu khach
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: ((tu sach) or (vu sach)) ky dang xa hoi. hieu ve cac thuc van ((hanh vai) or (hanh va)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky dang xa hoi. hieu ve cac thuc van ((hanh vai) OR (hanh va)) va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky dang xa hoi. hieu ve cac thuc van ((hanh vai) or (hanh va)) va triet*.