Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
hanh ve » hanh vi, hanh va
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
va cau » van cau, va cac, va dau
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach o lang xa hoi. hieu va cau thuc dan ((hanh ve) OR (hanh kem)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach o lang xa hoi. hieu va cau thuc dan ((hanh ve) OR (hanh kem)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach o lang xa hoi. hieu va cau thuc dan ((hanh ve) OR (hanh kem)) cua te*.