Perhaps you should try some spelling variations:
chat cuu » chat huu, chat cua, cham cuu
thi hang » thi hanh, thi hong, thi thanh
dua tren » dung tren
thi nang » thi cong, ki nang, thi hanh
hanh lap » thanh lap, hanh lam, hanh cap
ban hanh » ban hang
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cuu ban » cuu van, cua ban, cuu san
va chat » van chat, va phat, cao chat
tai hoi » tai khoi, dai hoi, tai hai
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 sach ((thi hang) or (thi nang)) tai hoi. hieu va chat cuu ban hanh lap ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thi hang) OR (thi nang)) tai hoi. hieu va chat cuu ban hanh lap ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach ((thi hang) or (thi nang)) tai hoi. hieu va chat cuu ban hanh lap ((dua tren) or (cua te))*.