Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
nang cau » nang cao, hang cau, nang dau
ban hang » ngan hang
tu triet » su triet, tu thiet, tu trien
tu sach » thu sach, su sach, te sach
qua cam » qua cham, qua cac, qua ca
cam tuc » cam xuc, cam tu, nam thuc

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 thi nang cau hoi. hieu qua cam tuc ((ban hanh) or (ban hang)) tai tu triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang cau hoi. hieu qua cam tuc ((ban hanh) OR (ban hang)) tai tu triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang cau hoi. hieu qua cam tuc ((ban hanh) or (ban hang)) tai tu triet*.