Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
hanh dua » hanh sua, hanh cua, hanh qua
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hanh da » hanh dao, hanh va, hanh de
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu va cam thuc vat ((hanh da) or (hanh dua)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu va cam thuc vat ((hanh da) OR (hanh dua)) cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu va cam thuc vat ((hanh da) or (hanh dua)) cau tren*.