Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
thi hang » thi nang, thi hong, thi thanh
thi hanh » thi thanh
van phan » van phong, van thanh, luan phan
phan lap » phan dau
hieu vi » hieu voi, hieu va, hieu ve
duc van » duc va, duc tan, duc manh
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: doc sach ((thi hang) OR (thi hanh)) tao boi. hieu vi pham duc van phan lap ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((thi hang) OR (thi hanh)) tao boi. hieu vi pham duc van phan lap ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((thi hang) OR (thi hanh)) tao boi. hieu vi pham duc van phan lap ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: doc sach ((thi hang) OR (thi hanh)) tao boi. hieu vi pham duc van phan lap ((cua te) or (cua tu))*.