Perhaps you should try some spelling variations:
nang dau » hang dau, xang dau, nang du
hanh tai » thanh tai, hang tai, hinh tai
han tai » hang tai, nhan tai, van tai
sach ty » sach y, sach tu, sach thu
dau hoi » cau hoi, dai hoi, dan hoi
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
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: su ((sac ky) or (sach ty)) nang dau hoi. hieu ve cam luc va ((hanh tai) OR (han tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach ty)) nang dau hoi. hieu ve cam luc va ((hanh tai) OR (han tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sach ty)) nang dau hoi. hieu ve cam luc va ((hanh tai) OR (han tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sach ty)) nang dau hoi. hieu ve cam luc va ((hanh tai) OR (han tai)) cua te*.