Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
cham cuu » cap cuu, chat cua
te sach » toc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
van han » van hanh, van phan, van nhan
tai cua » thai cua, tai cuc, tri cua
cua tuc » cua duc, cua tu, cua thuoc
va han » va phan, va hanh, va hang
x hoi » xa hoi, o hoi, 5 hoi

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 thi nang ((x hoi) OR (x ho)). hieu va cham cuu ((va han) OR (van han)) tai cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi nang ((x hoi) OR (x ho)). hieu va cham cuu ((va han) OR (van han)) tai cua tuc".
• Adding a wildcard symbol may retrieve word variants: te sach thi nang ((x hoi) OR (x ho)). hieu va cham cuu ((va han) OR (van han)) tai cua tuc*.