Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh doi » thanh loi, thanh moi, thanh do
thuc dan » thuc hanh, hoc dan, thuc vat
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc day
nang ma » tang ma, sang ma, nang cao
doi cua » dai cua, hoi cua
ma hoi » mai hoi, xa hoi, ma hoa
ve nam » he nam, va nam, le nam
te cac » tu cac, ve cac, te cao
te sac » te sach, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te cac)) ky nang ma hoi. hieu ve nam ((thuc va) or (thuc dan)) thanh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky nang ma hoi. hieu ve nam ((thuc va) OR (thuc dan)) thanh doi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te cac)) ky nang ma hoi. hieu ve nam ((thuc va) or (thuc dan)) thanh doi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te cac)) ky nang ma hoi. hieu ve nam ((thuc va) or (thuc dan)) thanh doi cua triet*.