Perhaps you should try some spelling variations:
chua tivi » chua tinh, chua tri
hoc sach » hoc sinh, hoc cac, hoc anh
nang mai » nang ma, nang tai, lang mai
hieu cao » chieu cao, hieu cac, hieu ca
chat hoc » chat hoa, chat thom, cho hoc
mai hoi » mai khoi, dai hoi, lai hoi
hanh va » hanh vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (hoc sach)) ky nang mai hoi. hieu cao chat hoc va ((hanh va) OR (hang va)) chua tivi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (hoc sach)) ky nang mai hoi. hieu cao chat hoc va ((hanh va) OR (hang va)) chua tivi.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (hoc sach)) ky nang mai hoi. hieu cao chat hoc va ((hanh va) OR (hang va)) chua tivi".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (hoc sach)) ky nang mai hoi. hieu cao chat hoc va ((hanh va) OR (hang va)) chua tivi*.