Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu nang » thi nang, thu hang, tho nang
hanh vai » hanh vi, hanh tai, hanh van
thu bang » thu ban, thu hang, chu bang
so sach » so sanh, bo sach, co sach
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
ma hoi » mai hoi, xa hoi, ma hoa
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 bang)) ma hoi. hieu ve pham thuc vat ((hanh vai) or (hanh va)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu bang)) ma hoi. hieu ve pham thuc vat ((hanh vai) OR (hanh va)) cua tu.
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) or (thu bang)) ma hoi. hieu ve pham thuc vat ((hanh vai) or (hanh va)) cua tu*.