Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc anh
lanh hai » manh hai, thanh hai, lang chai
san lanh » san doanh, san thanh, song lanh
cua viet » ca viet, hoa viet, cua vat
bo sach » co sach
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
dac san » dac sac, cac san, dac nhan
hoc cac » hoc cao
hai cua » thai cua, dai cua, hoi cua
dang xa » dang xay, lang xa, dang ha
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))) or (bo sach)) ky dang xa hoi. hieu ve cac dac san lanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((hoc sach) OR (hoc cac))) OR (bo sach)) ky dang xa hoi. hieu ve cac dac san lanh hai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hoc sach) OR (hoc cac))) or (bo sach)) ky dang xa hoi. hieu ve cac dac san lanh hai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((((hoc sach) OR (hoc cac))) or (bo sach)) ky dang xa hoi. hieu ve cac dac san lanh hai cua viet*.