Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
vat hanh » vat thanh, van hanh, va hanh
hanh vai » hanh vi, hanh va, hanh tai
bo sach » co sach, hoc sach
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
vai cua » dai cua, hai cua, lai cua
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: bo sach thieu ((nang cao) or (sang ma)) hoi. hieu ve pham thuc vat hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach thieu ((nang cao) OR (sang ma)) hoi. hieu ve pham thuc vat hanh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: bo sach thieu ((nang cao) or (sang ma)) hoi. hieu ve pham thuc vat hanh vai cua tu*.