Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach o » sach lo, sac o, mach o
ve cua » le cua, de cua, ve cum
te cua » tue cua, le cua, de cua

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) or (sach y)) lang xa hoi. hieu va cac thuc vat hanh ((ve cua) or (te cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach o) OR (sach y)) lang xa hoi. hieu va cac thuc vat hanh ((ve cua) OR (te cua)) te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach o) or (sach y)) lang xa hoi. hieu va cac thuc vat hanh ((ve cua) or (te cua)) te*.