Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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) or (so sanh)) y nang ma hoi. hieu va cac thuc vat hanh ((vi cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) y nang ma hoi. hieu va cac thuc vat hanh ((vi cua) OR (lai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang ma hoi. hieu va cac thuc vat hanh ((vi cua) or (lai cua)) tre*.