Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
pham hoang » pham hong, phap hoan, pham cong
hanh thoi » hanh thuoc, nhanh thai, hanh noi
thoi tap » toi tap, hoc tap, thoi dai
dan chan » dan gian, dan ca, van chat
chan van » chuan van, phan van, nhan van
hoi dan » hoa dan, hoc dan, hoi dap
mo hoc » mon hoc, co hoc
ma hoi » mai hoi, xa hoi, ma hoa
thuc » thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuc hanh thoi tap, nghien cuu mo hoc ((phan chong) or (pham hoang)) hoc ma hoi dan chan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuc hanh thoi tap, nghien cuu mo hoc ((phan chong) OR (pham hoang)) hoc ma hoi dan chan van.
• Adding a wildcard symbol may retrieve word variants: thuc hanh thoi tap, nghien cuu mo hoc ((phan chong) or (pham hoang)) hoc ma hoi dan chan van*.