Perhaps you should try some spelling variations:
van pham » san pham, van phan, van phat
thu nang » thi nang, thu bang, tho nang
hanh tai » thanh tai, hang tai, han tai
thu hang » thi hang, thuc hanh, thu huong
hanh vai » hanh vi, hanh va, hanh van
hieu van » hieu va, thien van, lieu va
pham huu » pham duc, pham duy, phan huy
so sach » so sanh, bo sach, co sach
huu va » cuu va, tuu va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((thu nang) OR (thu hang)) ma hoa. hieu van pham huu va ((hanh vai) or (hanh tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu hang)) ma hoa. hieu van pham huu va ((hanh vai) OR (hanh tai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu nang) OR (thu hang)) ma hoa. hieu van pham huu va ((hanh vai) or (hanh tai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) OR (thu hang)) ma hoa. hieu van pham huu va ((hanh vai) or (hanh tai)) cua tu*.