Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vien cac » vien bach, vien dai, vien da
thi nang » thi cong, ki nang, thi hanh
cau tren » cu tren, dau tren, ca tren
sach thi » sach thu, sach tai, sach thieu
kinh vi » dinh vi, kinh ve, kenh vi
va kinh » va tinh, qua kinh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, ve cac, va cam

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 xa hoi. hieu ((ve cam) or (vien cac)) duc va kinh vi ((cau tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang xa hoi. hieu ((ve cam) OR (vien cac)) duc va kinh vi ((cau tren) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang xa hoi. hieu ((ve cam) or (vien cac)) duc va kinh vi ((cau tren) or (cua viet))*.