Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
vat dinh » va dinh, van dinh, vat sinh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sinh y » sinh ly
y lang » o lang, _ lang, tay lang
ve cau » ke cau, va cau, ve cac
va cai » va cac, va bai, va dai
va ca » va cac, va cao, va cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh y lang xa hoi. hieu ve cau thuc vat dinh ((va ca) or (va cai)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh y lang xa hoi. hieu ve cau thuc vat dinh ((va ca) OR (va cai)) tren.
• Adding a wildcard symbol may retrieve word variants: hoc sinh y lang xa hoi. hieu ve cau thuc vat dinh ((va ca) or (va cai)) tren*.