Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
nang mai » nang ma, lang mai, nang cai
nang tai » hang tai, tang tai, sang tai
cac cua » cach cua, cac qua, ca cua
nam luc » nang luc, nhan luc, nam thuc
bo sac » bo sach
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sac ky ((nang mai) OR (nang tai)) hoi. hieu van nam luc ((va thanh) or (ban thanh)) cac cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sac ky ((nang mai) OR (nang tai)) hoi. hieu van nam luc ((va thanh) OR (ban thanh)) cac cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sac ky ((nang mai) OR (nang tai)) hoi. hieu van nam luc ((va thanh) or (ban thanh)) cac cua te".
• Adding a wildcard symbol may retrieve word variants: bo sac ky ((nang mai) OR (nang tai)) hoi. hieu van nam luc ((va thanh) or (ban thanh)) cac cua te*.