Perhaps you should try some spelling variations:
thu hoang » thu hang, thu hoan, thi hoang
hoang van » hang va
sanh thu » sach thu, san thu, doanh thu
pham duy » pham duc
so sanh » do sanh
va hanh » van hanh, va thanh, va danh
van hoc » van hoa
hieu va » hieu qua
cua tu » cua tuc, cua cu, cua te
duy va » duy vat, duy van, day va
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh thu hoang van hoc. ((hieu va) or (lieu va)) pham duy va hanh vi ((cua tu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thu hoang van hoc. ((hieu va) OR (lieu va)) pham duy va hanh vi ((cua tu) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: so sanh thu hoang van hoc. ((hieu va) or (lieu va)) pham duy va hanh vi ((cua tu) or (cua su))*.