Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham luc » cham soc, nhan luc, cham cuu
hoi tang » hoi lang, hoc tang, hoi dang
hang tai » hang va, dung tai
sach hoi » sach doi, sach moi, cach thoi
hanh va » hang va
tu sach » thu sach, su sach, te sach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoi tang ma hoi. hieu vu cham luc va ((hang tai) or (((hanh va) or (hanh vi)))) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tang ma hoi. hieu vu cham luc va ((hang tai) OR (((hanh va) OR (hanh vi)))) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tang ma hoi. hieu vu cham luc va ((hang tai) or (((hanh va) or (hanh vi)))) cau tren*.