Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc anh
van hanh » van thanh, ban hanh, van anh
sang cho » danh cho, dung cho, sang tao
cac dung » cach dung, cac duong, tac dung
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
ty sang » ty xang, ty hang, duy sang
hoc cac » hoc cao
cua cau » cua cac, cua chu, cua cay
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: ((hoc sach) OR (hoc cac)) ty sang cho hoc. hieu ve cac dung ((van hanh) or (van ban)) vai cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc cac)) ty sang cho hoc. hieu ve cac dung ((van hanh) OR (van ban)) vai cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc cac)) ty sang cho hoc. hieu ve cac dung ((van hanh) or (van ban)) vai cua cau*".