Perhaps you should try some spelling variations:
chu treo » cau treo, cau tren, chu tri
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
manh hai » lanh hai, minh hai, thanh hai
danh hai » dang hai, lanh hai, danh hau
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
cu tren » tu tren, dua tren
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang mai hoi. hieu van cam tuc va ((danh hai) OR (manh hai)) ((chu treo) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang mai hoi. hieu van cam tuc va ((danh hai) OR (manh hai)) ((chu treo) OR (cu tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang mai hoi. hieu van cam tuc va ((danh hai) OR (manh hai)) ((chu treo) or (cu tren))*".