Perhaps you should try some spelling variations:
trinh tiet » trinh thiet, trinh triet, trinh viet
va triet » va thiet, va trien, ve triet
tiet va » tien va, tiet may, viet van
duc lai » duc dai, duc loi, duc hai
duc lap » doc lap, duc lam, duc lan
tu cach » tu cac
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
va cham » va chat, va tham

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (vu sach)) ky nang xa hoi. hieu va cham ((duc lap) OR (duc lai)) trinh tiet va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (vu sach)) ky nang xa hoi. hieu va cham ((duc lap) OR (duc lai)) trinh tiet va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (vu sach)) ky nang xa hoi. hieu va cham ((duc lap) OR (duc lai)) trinh tiet va triet*".