Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
su sach » so sach, vu sach
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
cua tre » cua te, cua triet, dua tren
lai hoa » dai hoa, loai hoc
y nang » ky nang, ly nang, may nang
va nam » van nam, ha nam, va nay
thu va » thuc va, thue va, tu va
v nang » va nang, vu nang, van nang

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) or (v nang)) lai hoa. hieu va nam thu va hanh lam ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) lai hoa. hieu va nam thu va hanh lam ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (v nang)) lai hoa. hieu va nam thu va hanh lam ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) lai hoa. hieu va nam thu va hanh lam ((cuu tre) OR (cua tre))*.