Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
sach tham » sach nha
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
hanh va » hang va, hanh vi
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
va qua » va quan, va quy, va quang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach truc) or (sach tham)) nang ma hoi. hieu ve cam xuc van hanh va qua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach truc) OR (sach tham)) nang ma hoi. hieu ve cam xuc van hanh va qua su.
• Adding a wildcard symbol may retrieve word variants: te ((sach truc) or (sach tham)) nang ma hoi. hieu ve cam xuc van hanh va qua su*.