Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
dua tren » dung tren
dac nhan » cac nhan, danh nhan, ca nhan
dao hanh » dao thanh, dang hanh, ban hanh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x hoi. hieu va cam thuc ((dao hanh) or (dac nhan)) di ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu va cam thuc ((dao hanh) OR (dac nhan)) di ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu va cam thuc ((dao hanh) or (dac nhan)) di ((dua tren) or (cua triet))*.